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Note 6 - Valuation Accounts (Tables)
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Summary of Valuation Allowance [Table Text Block]
   

Balance Beginning

of Year

   

Net Charged to Costs and Expenses

   

Acquisitions

   

Net Write-Offs

   

Balance

End

of Year

 
                                         

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  
                                         

2011

                                       

Reserve for accounts receivable

  $ 1,040     $ 627             $ (1,187 )   $ 480  

Reserve for warranty receivable

    279       336               (135 )     480  

Reserve for parts inventory

    2,055       1,909     $ 650       (1,208 )     3,406  

Reserve for commercial vehicle inventory

    1,275       5,807               (5,458 )     1,624