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Note 14 - Commitments and Contingencies (Details) (USD $)
Dec. 31, 2014
Note 14 - Commitments and Contingencies (Details) [Line Items]  
Operating Leases, Future Minimum Payments Due $ 866,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Revenue Equipment Expenditure [Member]  
Note 14 - Commitments and Contingencies (Details) [Line Items]  
Contractual Obligation, Due in Next Twelve Months 80,400,000us-gaap_ContractualObligationDueInNextTwelveMonths
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= mrtn_RevenueEquipmentExpenditureMember
Building Construction and Acquisition Expenditures [Member]  
Note 14 - Commitments and Contingencies (Details) [Line Items]  
Contractual Obligation, Due in Next Twelve Months $ 6,500,000us-gaap_ContractualObligationDueInNextTwelveMonths
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= mrtn_BuildingConstructionAndAcquisitionExpendituresMember