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Note 6 - Valuation Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
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
  
                                 
2015
                                
Reserve for accounts receivable
   $ 639     $ 992     $ (1,125 )   $ 506  
Reserve for warranty receivable
     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 receivable
     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  
                                 
2013
                                
Reserve for accounts receivable
   $ 540     $ 1,163     $ (882 )   $ 821  
Reserve for warranty receivable
     444       626       (651 )     419  
Reserve for parts inventory
    3,593       2,560       (1,737 )     4,416  
Reserve for commercial vehicle inventory
     6,839       5,517       (4,961 )     7,395