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Note 6 - Valuation Accounts (Tables)
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Summary of Valuation Allowance [Table Text Block]
   

Balance Beginning

of Year

   

Net Charged to Costs and Expenses

   

Net Write-Offs

   

Balance

End

of Year

 
                                 

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       17,416       (14,167 )     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       13,020       (12,464 )     7,395  
                                 

2012

                               

Reserve for accounts receivable

  $ 480     $ 922     $ (862 )   $ 540  

Reserve for warranty receivable

    480       334       (370 )     444  

Reserve for parts inventory

    3,406       1,796       (1,609 )     3,593  

Reserve for commercial vehicle inventory

    1,624       12,944       (7,729 )     6,839