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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2017
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)
 
   
Balance at
    
Charged to
                  
   
Beginning of
    
Costs and
            
Balance at
  
Description
  
Year
    
Expenses
    
Deductions
 
  
End of Year
  
Insurance and claims accruals:
                                
Year ended December 31, 201
7
   $
19,440
     $
53,609
     $
(46,872
)
(1)
   $
26,177
  
Year ended December 31, 201
6
    
16,235
      
49,614
      
(46,409
)
(1)
    
19,440
  
Year ended December 31, 201
5
    
13,998
      
45,271
      
(43,034
)
(1)
    
16,235
  
                                 
                                 
Allowance for doubtful accounts:
                                
Ye
ar ended December 31, 2017
    
275
      
33
      
(8
)
(2)
    
300
  
Year ended December 31, 201
6
    
305
      
88
      
(118
)
(2)
    
275
  
Year ended December 31, 201
5
    
475
      
59
      
(229
)
(2)
    
305
  
 
(
1
)
Claims payments
(
2
)
Write-off of bad debts, net of recoveries
 
    
See report of independent registered public accounting firm.