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(ii) 3,020 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2024; (iii) 5,085 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2023; (iv) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2022; (v) 3,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021; and (vi) 84,656.03 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":291207.03,"source":{"system":"sec-edgar","filing":"0001235802-21-000069","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580221000069/primary_doc.xml","form_type":"4"}},{"id":2721886,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO and President"}}],"security":"Common Stock","published_at":"2021-05-10T20:30:51.000Z","date":"2021-05-06","kind":"tax_withholding","acquired":false,"shares":11852,"price":17.59,"value":208476.68,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares were withheld to cover the estimated tax withholding obligations in connection with the issuance of 28,151 shares released from the Issuer's deferred compensation plan which terminated effective May 5, 2021."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 10,447 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2025; (ii) 3,020 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2024; (iii) 5,085 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2023; (iv) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2022; (v) 3,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021; and (vi) 84,451.18 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":291002.18,"source":{"system":"sec-edgar","filing":"0001235802-21-000045","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580221000045/primary_doc.xml","form_type":"4"}},{"id":2725790,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO and President"}}],"security":"Common Stock","published_at":"2021-05-06T20:55:55.000Z","date":"2021-05-04","kind":"grant","acquired":true,"shares":10447,"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, 2021."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 10,447 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2025; (ii) 3,020 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2024; (iii) 5,085 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2023; (iv) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2022; (v) 3,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021; and (vi) 112,602.18 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":302854.18,"source":{"system":"sec-edgar","filing":"0001235802-21-000040","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580221000040/primary_doc.xml","form_type":"4"}},{"id":2765418,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2021-04-01T20:20:50.000Z","date":"2021-03-31","kind":"grant","acquired":true,"shares":264.79,"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, 2021."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,020 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2024; (ii) 5,085 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2023; (iii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2022; (iv) 3,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021; and (v) 112,602.18 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":292407.18,"source":{"system":"sec-edgar","filing":"0001235802-21-000016","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580221000016/primary_doc.xml","form_type":"4"}},{"id":2810259,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2021-03-04T21:46:12.000Z","date":"2021-03-02","kind":"tax_withholding","acquired":false,"shares":4759,"price":16,"value":76144.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,020 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2024; (ii) 5,085 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2023; (iii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2022; (iv) 3,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021; and (v) 112,337.39 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":292142.39,"source":{"system":"sec-edgar","filing":"0001235802-21-000013","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580221000013/primary_doc.xml","form_type":"4"}},{"id":2810258,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2021-03-04T21:46:12.000Z","date":"2021-03-02","kind":"grant","acquired":true,"shares":9723,"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, 8,460 shares have been deferred under the Issuer's deferred compensation plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,020 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2024; (ii) 5,085 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2023; (iii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021 through 12/31/2022; (iv) 3,900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2021; and (v) 112,337.39 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":296901.39,"source":{"system":"sec-edgar","filing":"0001235802-21-000013","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580221000013/primary_doc.xml","form_type":"4"}},{"id":2930549,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-12-29T22:00:04.000Z","date":"2020-12-28","kind":"grant","acquired":true,"shares":3105.97,"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, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,776 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 6,780 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 4,815 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 7,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 1,038 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 103,877.39 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":287178.39,"source":{"system":"sec-edgar","filing":"0001235802-20-000144","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000144/primary_doc.xml","form_type":"4"}},{"id":3019270,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-10-01T20:18:18.000Z","date":"2020-09-30","kind":"grant","acquired":true,"shares":246.38,"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, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On July 16, 2020, Marten declared a three-for-two  stock split effected in the form of a stock dividend, payable on August 13, 2020 to all holders of record of common stock on July 30, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes: (i) 3,776 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 6,780 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 4,815 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 7,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 1,038 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 100,771.42 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":284072.42,"source":{"system":"sec-edgar","filing":"0001235802-20-000113","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000113/primary_doc.xml","form_type":"4"}},{"id":3055227,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Stock Option (right to buy)","published_at":"2020-08-18T20:19:49.000Z","date":"2020-08-14","kind":"exercise","acquired":false,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"All shares are vested."}],"balance_after":0,"derivative":{"exercise_price":9.008,"expiration_date":"2022-05-12","underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001235802-20-000096","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000096/primary_doc.xml","form_type":"4"}},{"id":3055226,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-08-18T20:19:49.000Z","date":"2020-08-17","kind":"sale","acquired":false,"shares":25000,"price":18.5536,"value":463840.0,"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 $18.49 to $18.69, 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":"F1","text":"On July 16, 2020, Marten declared a three-for-two  stock split effected in the form of a stock dividend, payable on August 13, 2020 to all holders of record of common stock on July 30, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,776 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 6,780 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 4,815 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 7,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 1,038 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 100,525.04 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":283826.04,"source":{"system":"sec-edgar","filing":"0001235802-20-000096","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000096/primary_doc.xml","form_type":"4"}},{"id":3055225,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-08-18T20:19:49.000Z","date":"2020-08-14","kind":"sale","acquired":false,"shares":15000,"price":18.6198,"value":279297.0,"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 $18.50 to $18.82, 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":"On July 16, 2020, Marten declared a three-for-two  stock split effected in the form of a stock dividend, payable on August 13, 2020 to all holders of record of common stock on July 30, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,776 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 6,780 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 4,815 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 7,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 1,038 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 100,525.04 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":308826.04,"source":{"system":"sec-edgar","filing":"0001235802-20-000096","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000096/primary_doc.xml","form_type":"4"}},{"id":3055224,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-08-18T20:19:49.000Z","date":"2020-08-14","kind":"exercise","acquired":true,"shares":15000,"price":9.008,"value":135120.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On July 16, 2020, Marten declared a three-for-two  stock split effected in the form of a stock dividend, payable on August 13, 2020 to all holders of record of common stock on July 30, 2020."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,776 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; 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(ii) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 67,016.69 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":205883.69,"source":{"system":"sec-edgar","filing":"0001235802-20-000077","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000077/primary_doc.xml","form_type":"4"}},{"id":3158758,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-05-07T21:00:21.000Z","date":"2020-05-05","kind":"grant","acquired":true,"shares":2517,"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) 2,517 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2024; (ii) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (iii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iv) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (v) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (vi) 66,910.31 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":205777.31,"source":{"system":"sec-edgar","filing":"0001235802-20-000041","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000041/primary_doc.xml","form_type":"4"}},{"id":3165956,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Stock Option (right to buy)","published_at":"2020-05-01T20:53:54.000Z","date":"2020-05-01","kind":"exercise","acquired":false,"shares":14586,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"All shares are vested except for 10,000 shares that will vest on May 12, 2020."}],"balance_after":10000,"derivative":{"exercise_price":13.512,"expiration_date":"2022-05-12","underlying":"Common Stock","underlying_shares":14586},"source":{"system":"sec-edgar","filing":"0001235802-20-000033","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000033/primary_doc.xml","form_type":"4"}},{"id":3165955,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Stock Option (right to buy)","published_at":"2020-05-01T20:53:54.000Z","date":"2020-04-29","kind":"exercise","acquired":false,"shares":25414,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"All shares are vested except for 10,000 shares that will vest on May 12, 2020."}],"balance_after":24586,"derivative":{"exercise_price":13.512,"expiration_date":"2022-05-12","underlying":"Common Stock","underlying_shares":25414},"source":{"system":"sec-edgar","filing":"0001235802-20-000033","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000033/primary_doc.xml","form_type":"4"}},{"id":3165954,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-05-01T20:53:54.000Z","date":"2020-05-01","kind":"sale","acquired":false,"shares":14586,"price":23.1715,"value":337979.499,"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 $23.135 to $23.20, 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) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 66,910.31 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":203260.31,"source":{"system":"sec-edgar","filing":"0001235802-20-000033","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000033/primary_doc.xml","form_type":"4"}},{"id":3165953,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-05-01T20:53:54.000Z","date":"2020-05-01","kind":"exercise","acquired":true,"shares":14586,"price":13.512,"value":197086.032,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 66,910.31 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":217846.31,"source":{"system":"sec-edgar","filing":"0001235802-20-000033","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000033/primary_doc.xml","form_type":"4"}},{"id":3165952,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-05-01T20:53:54.000Z","date":"2020-04-29","kind":"sale","acquired":false,"shares":25414,"price":22.9375,"value":582933.625,"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 $22.76 to $23.19, 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) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 66,910.31 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":203260.31,"source":{"system":"sec-edgar","filing":"0001235802-20-000033","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000033/primary_doc.xml","form_type":"4"}},{"id":3165951,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-05-01T20:53:54.000Z","date":"2020-04-29","kind":"exercise","acquired":true,"shares":25414,"price":13.512,"value":343393.968,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 66,910.31 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":228674.31,"source":{"system":"sec-edgar","filing":"0001235802-20-000033","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000033/primary_doc.xml","form_type":"4"}},{"id":3190002,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-04-01T20:03:09.000Z","date":"2020-03-31","kind":"grant","acquired":true,"shares":130.18,"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) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 66,910.31 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":203260.31,"source":{"system":"sec-edgar","filing":"0001235802-20-000024","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000024/primary_doc.xml","form_type":"4"}},{"id":3225682,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-03-05T21:15:44.000Z","date":"2020-03-03","kind":"tax_withholding","acquired":false,"shares":3401,"price":19.68,"value":66931.68,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 66,780.13 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":203130.13,"source":{"system":"sec-edgar","filing":"0001235802-20-000014","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000014/primary_doc.xml","form_type":"4"}},{"id":3225681,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2020-03-05T21:15:44.000Z","date":"2020-03-03","kind":"grant","acquired":true,"shares":8342,"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, 7,266 shares have been deferred under the Issuer's deferred compensation plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 4,520 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2023; (ii) 3,210 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2022; (iii) 5,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2020 through 12/31/2021; (iv) 692  shares granted under a Performance Unit Award Agreement that vest on 12/31/2020; and (v) 66,780.13 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":206531.13,"source":{"system":"sec-edgar","filing":"0001235802-20-000014","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580220000014/primary_doc.xml","form_type":"4"}},{"id":3330099,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2019-12-30T21:02:13.000Z","date":"2019-12-27","kind":"grant","acquired":true,"shares":82.43,"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) 5,650 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2023; (ii) 4,280 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (iii) 7,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iv) 1,383 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (v) 700 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (vi) 59,514.13 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":198189.13,"source":{"system":"sec-edgar","filing":"0001235802-19-000142","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000142/primary_doc.xml","form_type":"4"}},{"id":3403831,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2019-10-01T20:19:50.000Z","date":"2019-09-30","kind":"grant","acquired":true,"shares":1883.2,"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) 5,650 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2023; (ii) 4,280 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2022; (iii) 7,800 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2021; (iv) 1,383 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2020; (v) 700 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019; and (vi) 59,431.70 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":198106.7,"source":{"system":"sec-edgar","filing":"0001235802-19-000125","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580219000125/primary_doc.xml","form_type":"4"}},{"id":3475388,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2019-07-01T20:24:33.000Z","date":"2019-06-28","kind":"grant","acquired":true,"shares":94.96,"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) 5,650 shares granted under a Performance Unit Award Agreement that vest on 12/31/2019 through 12/31/2023; 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(ii) 1,260 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2019; (iii) 870 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 through 12/31/2018, (iv) 652 shares granted under a Performance Unit Award Agreement that vest on 12/31/2017 and (v) 22,852.91 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":89449.91,"source":{"system":"sec-edgar","filing":"0001235802-17-000036","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580217000036/primary_doc.xml","form_type":"4"}},{"id":4510092,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2016-12-30T21:09:55.000Z","date":"2016-12-28","kind":"grant","acquired":true,"shares":22.91,"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) 2,075 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2020; (ii) 1,680 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2019; (iii) 1,305 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2018, (iv) 1,305 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2017, (v) 637 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 and (vi) 21,470.91 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":89244.91,"source":{"system":"sec-edgar","filing":"0001235802-16-000340","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580216000340/primary_doc.xml","form_type":"4"}},{"id":4593776,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":80038,"kind":"person","name":"KOHL TIMOTHY M","position":1,"cik":"0001187222","reported_name":"KOHL TIMOTHY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2016-09-28T20:17:09.000Z","date":"2016-09-27","kind":"grant","acquired":true,"shares":25.85,"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) 2,075 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2020; (ii) 1,680 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2019; (iii) 1,305 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2018, (iv) 1,305 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 through 12/31/2017, (v) 637 shares granted under a Performance Unit Award Agreement that vest on 12/31/2016 and (vi) 21,448.00 shares that the reporting person has deferred under the Issuer's deferred compensation plan."}],"balance_after":89222,"source":{"system":"sec-edgar","filing":"0001235802-16-000304","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580216000304/primary_doc.xml","form_type":"4"}}]}