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Note 1 - Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 45.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions |  |
Letters of Credit Outstanding, Amount (in Dollars) | $ 9.2 us-gaap_LettersOfCreditOutstandingAmount |  |
Number of Operating Segments | 6 us-gaap_NumberOfOperatingSegments |  |
Number of Reportable Segments | 4 us-gaap_NumberOfReportableSegments | 2 us-gaap_NumberOfReportableSegments |
Supplies and Maintenance Costs [Member] |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Amortization (in Dollars) | 5.7 us-gaap_AdjustmentForAmortization / us-gaap_IncomeStatementLocationAxis = mrtn_SuppliesAndMaintenanceCostsMember | 5.8 us-gaap_AdjustmentForAmortization / us-gaap_IncomeStatementLocationAxis = mrtn_SuppliesAndMaintenanceCostsMember | 5.6 us-gaap_AdjustmentForAmortization / us-gaap_IncomeStatementLocationAxis = mrtn_SuppliesAndMaintenanceCostsMember
Tractors [Member] |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Replacement of Equipment Period after Purchase | 4 years 73 days |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 25.00%us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage / us-gaap_PropertyPlantAndEquipmentByTypeAxis = mrtn_TractorsMember |  |
Trailers [Member] |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Replacement of Equipment Period after Purchase | 5 years 219 days |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 35.00%us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage / us-gaap_PropertyPlantAndEquipmentByTypeAxis = mrtn_TrailersMember |  |
Tires in Service [Member] |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 24 months |  |
Insurance Claims [Member] |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Letters of Credit Outstanding, Amount (in Dollars) | $ 9.2 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | UNITED STATES |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 99.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = country_US |  |

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