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Note 6 - Valuation Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
   
 
Balance
Beginning
of Year
    
Net
Charged to
Costs and
Expenses
    
 
 
Net Write-
Offs
    
 
Balance
End
of Year
  
                                 
201
7
                                
Reserve for accounts receivable
   $
549
     $
625
     $
(558
 )   $
616
  
Reserve for warranty receivable
s
    
114
      
713
      
(617
 )    
210
  
Reserve for parts inventory
    
4,885
      
1,414
      
(69
 )    
6,230
  
Reserve for commercial vehicle inventory
    
5,102
      
5,997
      
(5,146
 )    
5,953
  
                                 
201
6
                                
Reserve for accounts receivable
   $
506
     $
1,415
     $
(1,372
 )   $
549
  
Reserve for warranty receivable
s
    
105
      
833
      
(824
 )    
114
  
Reserve for parts inventory
    
7,291
      
3,400
      
(5,806
 )    
4,885
  
Reserve for commercial vehicle inventory
    
6,541
      
9,623
      
(11,062
 )    
5,102
  
                                 
2015
                                
Reserve for accounts receivable
   $
639
     $
992
     $
(1,125
 )   $
506
  
Reserve for warranty receivable
s
    
140
      
1,677
      
(1,712
 )    
105
  
Reserve for parts inventory
    
5,067
      
4,215
      
(1,991
 )    
7,291
  
Reserve for commercial vehicle inventory
    
10,644
      
8,417
      
(12,520
 )    
6,541