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Note 6 - Valuation Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
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
  
                                 
2018
                                
Reserve for accounts receivable
   $
616
     $
2,183
     $
(1,812
 )   $
987
  
Reserve for warranty receivables
    
210
      
2,031
      
(1,812
 )    
429
  
Reserve for parts inventory
    
6,230
      
2,744
      
(1,924
 )    
7,050
  
Reserve for commercial vehicle inventory
    
5,953
      
3,550
      
(4,916
 )    
4,587
  
                                 
2017
                                
Reserve for accounts receivable
   $
549
     $
625
     $
(558
 )   $
616
  
Reserve for warranty receivables
    
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
  
                                 
2016
                                
Reserve for accounts receivable
   $
506
     $
1,415
     $
(1,372
 )   $
549
  
Reserve for warranty receivables
    
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