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Note 7 - Stock Split (Details) (USD $)
0 Months Ended
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) 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-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 3us-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 2us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_NonmonetaryTransactionTypeAxis
= mrtn_StockSplitFromMember