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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
SEC Schedule, 12-09, 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, 2018
   $
26,177
     $
56,122
     $
(54,196
)
(1)
 		 $
28,103
  
Year ended December 31, 2017
    
19,440
      
53,609
      
(46,872
)
(1)
 		  
26,177
  
Year ended December 31, 2016
    
16,235
      
49,614
      
(46,409
)
(1)
 		  
19,440
  
                                 
                                 
Allowance for doubtful accounts:
                                
Year ended December 31, 2018
    
300
      
163
      
(115
)
(2)
 		  
348
  
Year ended December 31, 2017
    
275
      
33
      
(8
)
(2)
 		  
300
  
Year ended December 31, 2016
    
305
      
88
      
(118
)
(2)
 		  
275
  
 
(
1
)
Claims payments
(
2
)
Write-off of bad debts, net of recoveries
     
See report of independent registered public accounting firm.