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Note 2 - Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Note 2 - Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other [Line Items] |  |
Insurance premiums | $ 1,537 us-gaap_PrepaidInsurance | $ 1,384 us-gaap_PrepaidInsurance
Other | 2,734 us-gaap_OtherAssetsCurrent | 2,606 us-gaap_OtherAssetsCurrent
| 16,860 us-gaap_PrepaidExpenseAndOtherAssetsCurrent | 15,274 us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Tires in Service [Member] |  |
Note 2 - Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other [Line Items] |  |
Prepaid expenses | 4,438 us-gaap_PrepaidExpenseCurrent / us-gaap_FairValueByAssetClassAxis = mrtn_TiresInServiceMember | 3,982 us-gaap_PrepaidExpenseCurrent / us-gaap_FairValueByAssetClassAxis = mrtn_TiresInServiceMember
License Fees [Member] |  |
Note 2 - Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other [Line Items] |  |
Prepaid expenses | 4,397 us-gaap_PrepaidExpenseCurrent / us-gaap_FairValueByAssetClassAxis = mrtn_LicenseFeesMember | 4,169 us-gaap_PrepaidExpenseCurrent / us-gaap_FairValueByAssetClassAxis = mrtn_LicenseFeesMember
Parts and Tires in Inventory [Member] |  |
Note 2 - Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other [Line Items] |  |
Prepaid expenses | $ 3,754 us-gaap_PrepaidExpenseCurrent / us-gaap_FairValueByAssetClassAxis = mrtn_PartsAndTiresInInventoryMember | $ 3,133 us-gaap_PrepaidExpenseCurrent / us-gaap_FairValueByAssetClassAxis = mrtn_PartsAndTiresInInventoryMember

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