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Note 8 - Dividends (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | 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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012
Note 8 - Dividends (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Dividends (in Dollars) | $ 3.3 us-gaap_PaymentsOfDividends | $ 2.8 us-gaap_PaymentsOfDividends | $ 18.7 us-gaap_PaymentsOfDividends |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Dividend Restrictions, Percentage of Net Income Limit | 25.00%mrtn_LineOfCreditFacilityDividendRestrictionsPercentageOfNetIncomeLimit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid Quarterly [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 8 - Dividends (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.017 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.017 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.017 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.017 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.017 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember | $ 0.013 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_PaidQuarterlyMember
Special Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 8 - Dividends (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  | $ 0.50 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = mrtn_SpecialDividendMember |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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