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(ii) 9,120 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 6,525 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 10,400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 1,400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 138,226.44 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":17728580.44,"source":{"system":"sec-edgar","filing":"0001235802-20-000116","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000116/primary_doc.xml","form_type":"4"}},{"id":3093975,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-07-02T20:04:30.000Z","date":"2020-06-30","kind":"grant","acquired":true,"shares":145.91,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on June 30, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,548 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 91,925.65 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11818826.65,"source":{"system":"sec-edgar","filing":"0001235802-20-000075","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000075/primary_doc.xml","form_type":"4"}},{"id":3153540,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2020-05-12T20:11:59.000Z","date":"2020-05-12","kind":"exercise","acquired":false,"shares":13534,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"This option has fully vested."}],"balance_after":0,"derivative":{"exercise_price":13.512,"expiration_date":"2022-05-12","underlying":"Common Stock","underlying_shares":13534},"source":{"system":"sec-edgar","filing":"0001235802-20-000044","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000044/primary_doc.xml","form_type":"4"}},{"id":3153539,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-05-12T20:11:59.000Z","date":"2020-05-12","kind":"sale","acquired":false,"shares":13534,"price":24.667,"value":333843.178,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $24.50 to $25.00, inclusive.  The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 3,548 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11818680.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000044","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000044/primary_doc.xml","form_type":"4"}},{"id":3153538,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-05-12T20:11:59.000Z","date":"2020-05-12","kind":"exercise","acquired":true,"shares":13534,"price":13.512,"value":182871.408,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 3,548 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11832214.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000044","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000044/primary_doc.xml","form_type":"4"}},{"id":3158759,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-05-07T21:08:03.000Z","date":"2020-05-05","kind":"grant","acquired":true,"shares":3548,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares granted under a Performance Unit Award Agreement will vest in equal increments over five years beginning on December 31, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,548 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11818680.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000042","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000042/primary_doc.xml","form_type":"4"}},{"id":3165950,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Stock Option (right to buy)","published_at":"2020-05-01T20:15:30.000Z","date":"2020-05-01","kind":"exercise","acquired":false,"shares":10003,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"All shares are vested except for 13,534 shares that will vest on May 12, 2020."}],"balance_after":13534,"derivative":{"exercise_price":13.512,"expiration_date":"2022-05-12","underlying":"Common Stock","underlying_shares":10003},"source":{"system":"sec-edgar","filing":"0001235802-20-000032","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000032/primary_doc.xml","form_type":"4"}},{"id":3165949,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2020-05-01T20:15:30.000Z","date":"2020-05-01","kind":"sale","acquired":false,"shares":7500,"price":23.002,"value":172515.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $23.00 to $23.01, inclusive.  The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11815132.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000032","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000032/primary_doc.xml","form_type":"4"}},{"id":3165948,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2020-05-01T20:15:30.000Z","date":"2020-05-01","kind":"exercise","acquired":true,"shares":10003,"price":13.512,"value":135160.536,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; 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(ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11812629.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000030","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000030/primary_doc.xml","form_type":"4"}},{"id":3166927,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-04-30T21:26:05.000Z","date":"2020-04-30","kind":"exercise","acquired":true,"shares":1030,"price":13.512,"value":13917.36,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11813401.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000030","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000030/primary_doc.xml","form_type":"4"}},{"id":3166926,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-04-30T21:26:05.000Z","date":"2020-04-29","kind":"sale","acquired":false,"shares":14625,"price":23.0592,"value":337240.8,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $23.00 to $23.26, inclusive.  The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (3) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11812371.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000030","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000030/primary_doc.xml","form_type":"4"}},{"id":3166925,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-04-30T21:26:05.000Z","date":"2020-04-29","kind":"exercise","acquired":true,"shares":19500,"price":13.512,"value":263484.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11826996.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000030","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000030/primary_doc.xml","form_type":"4"}},{"id":3166924,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-04-30T21:26:05.000Z","date":"2020-04-28","kind":"sale","acquired":false,"shares":17703,"price":23.244,"value":411488.532,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $23.00 to $23.93, inclusive.  The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11807496.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000030","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000030/primary_doc.xml","form_type":"4"}},{"id":3166923,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-04-30T21:26:05.000Z","date":"2020-04-28","kind":"exercise","acquired":true,"shares":23600,"price":13.512,"value":318883.2,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11825199.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000030","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000030/primary_doc.xml","form_type":"4"}},{"id":3189938,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2020-04-01T20:11:51.000Z","date":"2020-03-31","kind":"grant","acquired":true,"shares":178.56,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on March 31, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,779.74 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11801599.74,"source":{"system":"sec-edgar","filing":"0001235802-20-000025","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000025/primary_doc.xml","form_type":"4"}},{"id":3225680,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-03-05T21:07:02.000Z","date":"2020-03-03","kind":"tax_withholding","acquired":false,"shares":4075,"price":19.68,"value":80196.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,601.18 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11801421.18,"source":{"system":"sec-edgar","filing":"0001235802-20-000013","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000013/primary_doc.xml","form_type":"4"}},{"id":3225679,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2020-03-05T21:07:02.000Z","date":"2020-03-03","kind":"grant","acquired":true,"shares":11224,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Of these shares and shares previously reported that vest based on service, 9,772 shares have been deferred under the Issuer's deferred compensation plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 6,080 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 4,350 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 6,932 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 933 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 91,601.18 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11805496.18,"source":{"system":"sec-edgar","filing":"0001235802-20-000013","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000013/primary_doc.xml","form_type":"4"}},{"id":3330101,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2019-12-30T21:08:09.000Z","date":"2019-12-27","kind":"grant","acquired":true,"shares":113.34,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on December 27, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,600 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2023; (ii) 5,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (iii) 10,398 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iv) 1,867 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (v) 950 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (vi) 81,829.18 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11794272.18,"source":{"system":"sec-edgar","filing":"0001235802-19-000143","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000143/primary_doc.xml","form_type":"4"}},{"id":3403819,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2019-10-01T20:31:03.000Z","date":"2019-09-30","kind":"grant","acquired":true,"shares":2589.32,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on September 30, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,600 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2023; (ii) 5,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (iii) 10,398 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iv) 1,867 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (v) 950 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (vi) 81,715.84 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11794158.84,"source":{"system":"sec-edgar","filing":"0001235802-19-000126","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000126/primary_doc.xml","form_type":"4"}},{"id":3475430,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2019-07-01T20:39:50.000Z","date":"2019-06-28","kind":"grant","acquired":true,"shares":130.57,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on June 28, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,600 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2023; (ii) 5,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (iii) 10,398 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iv) 1,867 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (v) 950 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (vi) 79,126.52 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11791569.52,"source":{"system":"sec-edgar","filing":"0001235802-19-000070","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000070/primary_doc.xml","form_type":"4"}},{"id":3534225,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2019-05-09T20:40:14.000Z","date":"2019-05-07","kind":"grant","acquired":true,"shares":7600,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares granted under a Performance Unit Award Agreement will vest in equal increments over five years beginning on December 31, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,600 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2023; (ii) 5,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (iii) 10,398 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iv) 1,867 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (v) 950 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (vi) 78,995.95 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11791438.95,"source":{"system":"sec-edgar","filing":"0001686266-19-000016","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000168626619000016/primary_doc.xml","form_type":"4"}},{"id":3573070,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2019-04-01T20:06:55.000Z","date":"2019-03-29","kind":"grant","acquired":true,"shares":132.69,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on March 29, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 5,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (ii) 10,398 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iii) 1,867 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (iv) 950 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (v) 78,995.95 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11783838.95,"source":{"system":"sec-edgar","filing":"0001235802-19-000031","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000031/primary_doc.xml","form_type":"4"}},{"id":3627674,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2019-02-28T21:16:16.000Z","date":"2019-02-26","kind":"tax_withholding","acquired":false,"shares":8732,"price":19,"value":165908.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 5,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (ii) 10,398 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iii) 1,867 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (iv) 950 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (v) 78,863.26 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11783706.26,"source":{"system":"sec-edgar","filing":"0001235802-19-000015","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000015/primary_doc.xml","form_type":"4"}},{"id":3627673,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2019-02-28T21:16:16.000Z","date":"2019-02-26","kind":"grant","acquired":true,"shares":34080,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Of these shares and shares previously reported that vest based on service, 20,940 shares have been deferred under the Issuer's deferred compensation plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 5,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (ii) 10,398 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iii) 1,867 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (iv) 950 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (v) 78,863.26 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11792438.26,"source":{"system":"sec-edgar","filing":"0001235802-19-000015","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000015/primary_doc.xml","form_type":"4"}},{"id":3664387,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2019-02-12T21:10:14.000Z","date":"2019-02-11","kind":"sale","acquired":false,"shares":1116,"price":18.47,"value":20612.52,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,923.26 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11758358.26,"source":{"system":"sec-edgar","filing":"0001235802-19-000012","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000012/primary_doc.xml","form_type":"4"}},{"id":3664386,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2019-02-12T21:10:14.000Z","date":"2019-02-08","kind":"sale","acquired":false,"shares":8881,"price":18.58,"value":165008.98,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $18.50 to $18.915, inclusive.  The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,923.26 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11759474.26,"source":{"system":"sec-edgar","filing":"0001235802-19-000012","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000012/primary_doc.xml","form_type":"4"}},{"id":3671289,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2019-02-07T23:18:02.000Z","date":"2019-02-07","kind":"sale","acquired":false,"shares":39857,"price":18.8137,"value":749857.6409,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.69 to $19.065, inclusive. The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (4) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,923.26 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11768355.26,"source":{"system":"sec-edgar","filing":"0001235802-19-000011","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000011/primary_doc.xml","form_type":"4"}},{"id":3671288,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2019-02-07T23:18:02.000Z","date":"2019-02-06","kind":"sale","acquired":false,"shares":5187,"price":19.0294,"value":98705.4978,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.00 to $19.1275, inclusive. The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (3) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,923.26 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11808212.26,"source":{"system":"sec-edgar","filing":"0001235802-19-000011","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000011/primary_doc.xml","form_type":"4"}},{"id":3671287,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2019-02-07T23:18:02.000Z","date":"2019-02-05","kind":"sale","acquired":false,"shares":44959,"price":19.1963,"value":863046.4517,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.15 to $19.26, inclusive. The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,923.26 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11813399.26,"source":{"system":"sec-edgar","filing":"0001235802-19-000011","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000011/primary_doc.xml","form_type":"4"}},{"id":3715216,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2019-01-02T21:53:50.000Z","date":"2018-12-28","kind":"grant","acquired":true,"shares":88.92,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on December 28, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,923.26 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11858358.26,"source":{"system":"sec-edgar","filing":"0001235802-19-000003","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000003/primary_doc.xml","form_type":"4"}},{"id":3771075,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2018-11-08T21:10:46.000Z","date":"2018-11-08","kind":"gift","acquired":false,"shares":500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,834.34 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11858269.34,"source":{"system":"sec-edgar","filing":"0001235802-18-000160","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580218000160/primary_doc.xml","form_type":"4"}},{"id":3804952,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of Board and CEO"}}],"security":"Common Stock","published_at":"2018-10-01T21:32:16.000Z","date":"2018-09-28","kind":"grant","acquired":true,"shares":68.61,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on September 28, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,834.34 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11858769.34,"source":{"system":"sec-edgar","filing":"0001235802-18-000152","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580218000152/primary_doc.xml","form_type":"4"}},{"id":3879692,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2018-07-02T20:38:55.000Z","date":"2018-06-29","kind":"grant","acquired":true,"shares":61.52,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on June 29, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,765.73 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11858700.73,"source":{"system":"sec-edgar","filing":"0001235802-18-000089","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580218000089/primary_doc.xml","form_type":"4"}},{"id":3939915,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2018-05-10T20:28:23.000Z","date":"2018-05-08","kind":"grant","acquired":true,"shares":7250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares granted under a Performance Unit Award Agreement will vest in equal increments over five years beginning on December 31, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 7,250 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2022; (ii) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021; (iii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iv) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (v) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (vi) 57,704.21 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11858639.21,"source":{"system":"sec-edgar","filing":"0001235802-18-000057","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580218000057/primary_doc.xml","form_type":"4"}},{"id":3979028,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2018-03-30T15:33:08.000Z","date":"2018-03-30","kind":"grant","acquired":true,"shares":63.2,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on March 30, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021;  (ii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iii) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (iv) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (v) 57,704.21 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11851389.21,"source":{"system":"sec-edgar","filing":"0001235802-18-000046","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580218000046/primary_doc.xml","form_type":"4"}},{"id":4004479,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2018-03-09T21:21:15.000Z","date":"2018-03-07","kind":"tax_withholding","acquired":false,"shares":1211,"price":21.85,"value":26460.35,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021;  (ii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iii) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (iv) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (v) 57,641.01 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11851326.01,"source":{"system":"sec-edgar","filing":"0001235802-18-000035","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580218000035/primary_doc.xml","form_type":"4"}},{"id":4004478,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2018-03-09T21:21:15.000Z","date":"2018-03-07","kind":"grant","acquired":true,"shares":1345,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Of these shares and shares previously reported that vest based on service, 4,598 shares have been deferred under the Issuer's deferred compensation plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 13,865 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2021;  (ii) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2020; (iii) 1,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 through 12/31/2019; (iv) 1,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2018 and (v) 57,641.01 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11852537.01,"source":{"system":"sec-edgar","filing":"0001235802-18-000035","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580218000035/primary_doc.xml","form_type":"4"}},{"id":4118301,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2018-01-02T21:43:01.000Z","date":"2017-12-29","kind":"grant","acquired":true,"shares":65.24,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on December 29, 2017."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 17,333 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2021;  (ii) 3,733 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (iii) 2,850 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iv) 2,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (v) 1,500 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (vi) 53,043.01 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11851192.01,"source":{"system":"sec-edgar","filing":"0001235802-18-000003","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580218000003/primary_doc.xml","form_type":"4"}},{"id":4198490,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2017-10-02T21:18:16.000Z","date":"2017-09-29","kind":"grant","acquired":true,"shares":64.37,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on September 29, 2017."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On June 15, 2017, Marten declared a stock split effected in the form of a stock dividend, payable on July 7, 2017 to all holders of record of common stock on June 26, 2017, of two-thirds additional share of common stock for each one share of common stock outstanding."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes: (i) 17,333 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2021;  (ii) 3,733 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (iii) 2,850 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iv) 2,000 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (v) 1,500 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (vi) 52,977.77 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":11851126.77,"source":{"system":"sec-edgar","filing":"0001235802-17-000155","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000155/primary_doc.xml","form_type":"4"}},{"id":4266356,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stok","published_at":"2017-07-05T20:08:00.000Z","date":"2017-06-30","kind":"grant","acquired":true,"shares":28.94,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on June 30, 2017."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 10,400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2021;  (ii) 2,240 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (iii) 1,710 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iv) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (v) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (vi) 31,748.04 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7110638.04,"source":{"system":"sec-edgar","filing":"0001235802-17-000098","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000098/primary_doc.xml","form_type":"4"}},{"id":4274062,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2017-06-23T20:11:56.000Z","date":"2017-06-22","kind":"gift","acquired":false,"shares":500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 10,400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2021;  (ii) 2,240 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (iii) 1,710 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iv) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (v) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (vi) 31,719.10 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7110609.1,"source":{"system":"sec-edgar","filing":"0001235802-17-000086","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000086/primary_doc.xml","form_type":"4"}},{"id":4290520,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2017-06-07T20:09:37.000Z","date":"2017-06-06","kind":"sale","acquired":false,"shares":21900,"price":25.47,"value":557793.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $25.225 to $25.80, inclusive.  The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (3) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 10,400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2021;  (ii) 2,240 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (iii) 1,710 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iv) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (v) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (vi) 31,719.10 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7111109.1,"source":{"system":"sec-edgar","filing":"0001235802-17-000072","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000072/primary_doc.xml","form_type":"4"}},{"id":4290519,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2017-06-07T20:09:37.000Z","date":"2017-06-05","kind":"sale","acquired":false,"shares":28100,"price":25.54,"value":717674.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $25.40 to $25.70, inclusive.  The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 10,400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2021;  (ii) 2,240 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (iii) 1,710 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iv) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (v) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (vi) 31,719.10 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7133009.1,"source":{"system":"sec-edgar","filing":"0001235802-17-000072","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000072/primary_doc.xml","form_type":"4"}},{"id":4325892,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2017-05-11T20:32:18.000Z","date":"2017-05-09","kind":"grant","acquired":true,"shares":10400,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares granted under a Performance Unit Award Agreement will vest in equal increments over five years beginning on December 31, 2017."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 10,400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2021;  (ii) 2,240 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (iii) 1,710 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iv) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (v) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (vi) 31,719.10 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7161109.1,"source":{"system":"sec-edgar","filing":"0001686266-17-000004","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000168626617000004/primary_doc.xml","form_type":"4"}},{"id":4366007,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2017-04-03T20:38:10.000Z","date":"2017-03-31","kind":"grant","acquired":true,"shares":33.78,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on March 31, 2017."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes:  (i) 2,240 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (ii) 1,710 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iii) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (iv) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (v) 31,719.10 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7150709.1,"source":{"system":"sec-edgar","filing":"0001235802-17-000045","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000045/primary_doc.xml","form_type":"4"}},{"id":4383325,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2017-03-16T20:33:53.000Z","date":"2017-03-14","kind":"tax_withholding","acquired":false,"shares":536,"price":23.7,"value":12703.2,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes:  (i) 2,240 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (ii) 1,710 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iii) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (iv) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (v) 31,685.32 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7150675.32,"source":{"system":"sec-edgar","filing":"0001235802-17-000037","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000037/primary_doc.xml","form_type":"4"}},{"id":4383324,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board and CEO"}}],"security":"Common Stock","published_at":"2017-03-16T20:33:53.000Z","date":"2017-03-14","kind":"grant","acquired":true,"shares":274,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Of these shares and shares previously reported that vest based on service, 1,853 shares have been deferred under the Issuer's deferred compensation plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes:  (i) 2,240 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2020; (ii) 1,710 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iii) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (iv) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (v) 31,685.32 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7151211.32,"source":{"system":"sec-edgar","filing":"0001235802-17-000037","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000037/primary_doc.xml","form_type":"4"}},{"id":4510093,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2016-12-30T21:17:27.000Z","date":"2016-12-28","kind":"grant","acquired":true,"shares":31.84,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on December 28, 2016."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes:  (i) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2020; (ii) 2,280 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2019; (iii) 1,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2018, (iv) 1,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2017, (v) 803 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 and (vi) 29,832.32 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7150937.32,"source":{"system":"sec-edgar","filing":"0001235802-16-000341","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580216000341/primary_doc.xml","form_type":"4"}},{"id":4593779,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":27891,"kind":"person","name":"MARTEN RANDOLPH L","position":1,"cik":"0001253979","reported_name":"MARTEN RANDOLPH L","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman of the Board & CEO"}}],"security":"Common Stock","published_at":"2016-09-28T20:23:52.000Z","date":"2016-09-27","kind":"grant","acquired":true,"shares":35.91,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents dividend equivalent rights that accrued on September 27, 2016."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes:  (i) 2,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2020; (ii) 2,280 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2019; (iii) 1,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2018, (iv) 1,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2017, (v) 803 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 and (vi) 29,800.48 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":7150905.48,"source":{"system":"sec-edgar","filing":"0001235802-16-000305","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580216000305/primary_doc.xml","form_type":"4"}}]}