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All vested shares were previously reported as they vested based on service."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 4,098 shares granted under a Performance Award Agreement that vest on 12/31/2026 through 12/31/2029; (ii) 2,314 shares granted under a Performance Award Agreement that vest on 12/31/2026 through 12/31/2028; (iii) 600 shares granted under a Performance Award Agreement that vest on 12/31/2026 through 12/31/2027; and (iv) 300 shares granted under a Performance Award Agreement that vest on 12/31/2026."}],"balance_after":10623,"source":{"system":"sec-edgar","filing":"0002005041-26-000001","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000200504126000001/primary_doc.xml","form_type":"4"}},{"id":1155633,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":49252,"kind":"person","name":"Phillips Adam Daniel","position":1,"cik":"0002005041","reported_name":"Phillips Adam Daniel","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Operating Officer"}}],"security":"Common Stock","published_at":"2025-05-08T21:07:08.000Z","date":"2025-05-06","kind":"grant","planned":false,"acquired":true,"shares":5122,"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, 2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 5,122 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025 through 12/31/2029; (ii) 3,086 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025 through 12/31/2028; (iii) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025 through 12/31/2027; (iv) 600 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025 through 12/31/2026; and (v) 200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025."}],"balance_after":11754,"source":{"system":"sec-edgar","filing":"0002005041-25-000003","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000200504125000003/primary_doc.xml","form_type":"4"}},{"id":1210953,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":49252,"kind":"person","name":"Phillips Adam Daniel","position":1,"cik":"0002005041","reported_name":"Phillips Adam Daniel","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Operating Officer"}}],"security":"Common Stock","published_at":"2025-03-12T20:25:16.000Z","date":"2025-03-11","kind":"tax_withholding","planned":false,"acquired":false,"shares":816,"price":14.01,"value":11432.16,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Of the 1,872 shares that vested, this number of shares were withheld in exchange for payment of employee taxes.  All vested shares were previously reported as they vested based on service."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes: (i) 3,086 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025 through 12/31/2028; (ii) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025 through 12/31/2027; (iii) 600 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025 through 12/31/2026; and (iv) 200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2025."}],"balance_after":6632,"source":{"system":"sec-edgar","filing":"0001235802-25-000017","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580225000017/primary_doc.xml","form_type":"4"}},{"id":1448989,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":49252,"kind":"person","name":"Phillips Adam Daniel","position":1,"cik":"0002005041","reported_name":"Phillips Adam Daniel","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2024-07-25T20:54:57.000Z","date":"2024-07-25","kind":"exercise","planned":false,"acquired":false,"shares":4500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"All shares are vested."}],"balance_after":0,"derivative":{"exercise_price":10.867,"expiration_date":"2024-08-15","underlying":"Common Stock","underlying_shares":4500},"source":{"system":"sec-edgar","filing":"0001235802-24-000057","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580224000057/primary_doc.xml","form_type":"4"}},{"id":1448988,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":49252,"kind":"person","name":"Phillips Adam Daniel","position":1,"cik":"0002005041","reported_name":"Phillips Adam Daniel","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Operating Officer"}}],"security":"Common Stock","published_at":"2024-07-25T20:54:57.000Z","date":"2024-07-25","kind":"sale","planned":false,"acquired":false,"shares":4500,"price":18.3412,"value":82535.4,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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) 3,858 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2028; (ii) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2027; (iii) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2026; (iv) 400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2025; and (v) 300 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024."}],"balance_after":7448,"source":{"system":"sec-edgar","filing":"0001235802-24-000057","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/799167/000123580224000057/primary_doc.xml","form_type":"4"}},{"id":1448987,"issuer":{"id":4880,"kind":"organization","name":"MARTEN TRANSPORT LTD"},"owners":[{"id":49252,"kind":"person","name":"Phillips Adam Daniel","position":1,"cik":"0002005041","reported_name":"Phillips Adam Daniel","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Operating Officer"}}],"security":"Common Stock","published_at":"2024-07-25T20:54:57.000Z","date":"2024-07-25","kind":"exercise","planned":false,"acquired":true,"shares":4500,"price":10.867,"value":48901.5,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes: (i) 3,858 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2028; 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