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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
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, 2015
   $ 13,998     $ 45,271     $ (43,034 )
(1)
   $ 16,235  
Year ended December 31, 2014
     14,404       41,036       (41,442 )
(1)
     13,998  
Year ended December 31, 2013
     13,838       35,194       (34,628 )
(1)
     14,404  
                                 
                                 
Allowance for doubtful accounts:
                                
Year ended December 31, 2015
     475       59       (229 )
(2)
     305  
Year ended December 31, 2014
     450       264       (239 )
(2)
     475  
Year ended December 31, 2013
     334       225       (109 )
(2)
     450  
 
 
(1)       Claims payments
(2)       Write-off of bad debts, net of recoveries