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Note 9 - Commitments and Contingencies (Details Textual) (USD $)
Mar. 31, 2015
Operating Leases, Future Minimum Payments Due $ 759,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Revenue Equipment Expenditure [Member]  
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year 67,800,000us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= mrtn_RevenueEquipmentExpenditureMember
Building Construction and Acquisition Expenditures [Member]  
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year $ 4,900,000us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= mrtn_BuildingConstructionAndAcquisitionExpendituresMember