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Note 6 - Valuation Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
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
  
                                 
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
  
                                 
2015
                                
Reserve for accounts receivable
   $
639
     $
992
     $
(1,125
 )   $
506
  
Reserve for warranty receivables
    
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
  
                                 
2014
                                
Reserve for accounts receivable
   $
821
     $
919
     $
(1,101
 )   $
639
  
Reserve for warranty receivables
    
419
      
411
      
(690
 )    
140
  
Reserve for parts inventory
   
4,416
      
2,547
      
(1,896
 )    
5,067
  
Reserve for commercial vehicle inventory
    
7,395
      
7,877
      
(4,628
 )    
10,644