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Note 7 - Stock Split (Details) (USD $) | 0 Months Ended |  |
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Jun. 14, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Note 7 - Stock Split (Details) [Line Items] |  |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) | 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Stockholders' Equity Note, StockSplit Stock Dividend Percentage | 50.00%mrtn_StockholdersEquityNoteStockSplitStockDividendPercentage |  |
Stock Split To [Member] |  |  |
Note 7 - Stock Split (Details) [Line Items] |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 3 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_NonmonetaryTransactionTypeAxis = mrtn_StockSplitToMember |  |
Stock Split From [Member] |  |  |
Note 7 - Stock Split (Details) [Line Items] |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 2 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_NonmonetaryTransactionTypeAxis = mrtn_StockSplitFromMember |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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