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Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2012
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
SCHEDULE II

MARTEN TRANSPORT, LTD.

Valuation and Qualifying Accounts and Reserves

(In thousands)

Description
 
Balance at
Beginning of
Year
   
Charged to
Costs and
Expenses
   
Deductions
   
Balance at
End of Year
 
Insurance and claims accruals:
                       
Year ended December 31, 2012
  $ 13,042     $ 32,548     $ (31,752 )(1)   $ 13,838  
Year ended December 31, 2011
    17,653       27,675       (32,286 )(1)     13,042  
Year ended December 31, 2010
    19,222       24,892       (26,461 )(1)     17,653  
                                 
                                 
Allowance for doubtful accounts:
                               
Year ended December 31, 2012
    470       —       (136 )(2)     334  
Year ended December 31, 2011
    170       544       (244 )(2)     470  
Year ended December 31, 2010
    245       (21 )     (54 )(2)     170  

(1)
Claims payments

(2)
Write-off of bad debts, net of recoveries