{"cik":799167,"taxonomy":"us-gaap","tag":"ShareBasedCompensation","label":"Share-based Payment Arrangement, Noncash Expense","description":"Amount of noncash expense for share-based payment arrangement.","entityName":"MARTEN TRANSPORT, LTD.","units":{"USD":[{"start":"2022-01-01","end":"2022-06-30","val":1573000,"accn":"0001437749-23-022208","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-07"},{"start":"2022-01-01","end":"2022-09-30","val":2228000,"accn":"0001437749-23-030762","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-08"},{"start":"2023-01-01","end":"2023-03-31","val":354000,"accn":"0001437749-24-015446","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-09","frame":"CY2023Q1"},{"start":"2023-01-01","end":"2023-06-30","val":1359000,"accn":"0001437749-23-022208","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-07"},{"start":"2023-01-01","end":"2023-06-30","val":1359000,"accn":"0001437749-24-025273","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-08"},{"start":"2023-01-01","end":"2023-09-30","val":1860000,"accn":"0001437749-23-030762","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-08"},{"start":"2023-01-01","end":"2023-09-30","val":1860000,"accn":"0001437749-24-034042","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-08"},{"start":"2023-01-01","end":"2023-12-31","val":2319000,"accn":"0001437749-26-005971","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-27","frame":"CY2023"},{"start":"2024-01-01","end":"2024-03-31","val":353000,"accn":"0001437749-24-015446","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-09"},{"start":"2024-01-01","end":"2024-03-31","val":353000,"accn":"0001437749-25-015634","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-09","frame":"CY2024Q1"},{"start":"2024-01-01","end":"2024-06-30","val":1364000,"accn":"0001437749-24-025273","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-08"},{"start":"2024-01-01","end":"2024-06-30","val":1364000,"accn":"0001437749-25-025548","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-08"},{"start":"2024-01-01","end":"2024-09-30","val":1783000,"accn":"0001437749-24-034042","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-08"},{"start":"2024-01-01","end":"2024-09-30","val":1783000,"accn":"0001437749-25-033702","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-07"},{"start":"2024-01-01","end":"2024-12-31","val":2236000,"accn":"0001437749-26-005971","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-27","frame":"CY2024"},{"start":"2025-01-01","end":"2025-03-31","val":407000,"accn":"0001437749-25-015634","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-09"},{"start":"2025-01-01","end":"2025-03-31","val":407000,"accn":"0001437749-26-015748","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-08","frame":"CY2025Q1"},{"start":"2025-01-01","end":"2025-06-30","val":1328000,"accn":"0001437749-25-025548","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-08"},{"start":"2025-01-01","end":"2025-09-30","val":1477000,"accn":"0001437749-25-033702","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-07"},{"start":"2025-01-01","end":"2025-12-31","val":1859000,"accn":"0001437749-26-005971","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-27","frame":"CY2025"},{"start":"2026-01-01","end":"2026-03-31","val":135000,"accn":"0001437749-26-015748","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-08","frame":"CY2026Q1"}]}}