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v2.4.1.9

Note 9 - Equity Investment (Details) (MWL [Member], USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 | Mar. 28, 2013
Note 9 - Equity Investment (Details) [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investments |  |  |  |  | $ 2,600,000 us-gaap_EquityMethodInvestments
Revenue from Related Parties | 8,500,000 us-gaap_RevenueFromRelatedParties | 8,200,000 us-gaap_RevenueFromRelatedParties | 9,700,000 us-gaap_RevenueFromRelatedParties |  |
Trade Accounts Receivable [Member] |  |  |  |  |
Note 9 - Equity Investment (Details) [Line Items] |  |  |  |  |
Due from Affiliates | 920,000 us-gaap_DueFromAffiliates / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mrtn_MWLMember |  |  |  |
Current Accounts Receivable [Member] |  |  |  |  |
Note 9 - Equity Investment (Details) [Line Items] |  |  |  |  |
Due to Affiliate | 466,000 us-gaap_DueToAffiliateCurrentAndNoncurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mrtn_CurrentAccountsReceivableMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mrtn_MWLMember |  |  |  |
Intersegment Eliminations [Member] |  |  |  |  |
Note 9 - Equity Investment (Details) [Line Items] |  |  |  |  |
Revenue, Net |  | $ 2,100,000 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mrtn_MWLMember | $ 9,700,000 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mrtn_MWLMember |  |
Percentage Owned By Non-Related Party [Member] |  |  |  |  |
Note 9 - Equity Investment (Details) [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mrtn_MWLMember / us-gaap_StatementScenarioAxis = mrtn_PercentageOwnedByNonRelatedPartyMember |

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