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Note 15 - Business Segments (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 28, 2013
Note 15 - Business Segments (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  | 6 us-gaap_NumberOfOperatingSegments |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 4 us-gaap_NumberOfReportableSegments | 2 us-gaap_NumberOfReportableSegments |  |
Revenues | $ 173,547,000 us-gaap_Revenues | $ 171,550,000 us-gaap_Revenues | $ 168,423,000 us-gaap_Revenues | $ 159,409,000 us-gaap_Revenues | $ 166,224,000 us-gaap_Revenues | $ 167,103,000 us-gaap_Revenues | $ 161,413,000 us-gaap_Revenues | $ 164,474,000 us-gaap_Revenues | $ 672,929,000 us-gaap_Revenues | $ 659,214,000 us-gaap_Revenues | $ 638,456,000 us-gaap_Revenues |
Logistics [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Business Segments (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,100,000 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = mrtn_LogisticsMember | 9,700,000 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = mrtn_LogisticsMember |
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Business Segments (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 448,273,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_TruckloadMember | 464,959,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_TruckloadMember | 463,712,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_TruckloadMember |
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 53,000,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_TruckloadMember | 54,600,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_TruckloadMember | 54,500,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_TruckloadMember |
Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Business Segments (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 70,352,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_DedicatedMember | 42,320,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_DedicatedMember | 19,611,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_DedicatedMember |
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 8,200,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_DedicatedMember | 4,700,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_DedicatedMember | 2,200,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_DedicatedMember |
Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Business Segments (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 97,092,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_IntermodalMember | 92,513,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_IntermodalMember | 71,324,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_IntermodalMember |
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 6,000,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_IntermodalMember | 4,300,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_IntermodalMember | 3,300,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_IntermodalMember |
Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Business Segments (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 57,212,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_BrokerageMember | 59,422,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_BrokerageMember | 83,809,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mrtn_BrokerageMember |
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | $ 993,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_BrokerageMember | $ 845,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_BrokerageMember | $ 919,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mrtn_BrokerageMember |
MWL [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 15 - Business Segments (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mrtn_MWLMember |  |  |  |  |  |  |  |  | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mrtn_MWLMember

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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