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Note 6 - Valuation Accounts (Details) - Valuation and Allowance Accounts (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Trade Receivables [Member]
      
2013      
Balance Beginning of Year $ 540 $ 480 $ 1,040
Net Charged to Costs and Expenses 1,163 922 627
Net Write - Offs (882) (862) (1,187)
Balance End of Year 821 540 480
Allowance for Warranty Receivables from Manufacturers [Member]
      
2013      
Balance Beginning of Year 444 480 279
Net Charged to Costs and Expenses 626 334 336
Net Write - Offs (651) (370) (135)
Balance End of Year 419 444 480
Parts Inventory [Member]
      
2013      
Balance Beginning of Year 3,593 3,406 2,055
Net Charged to Costs and Expenses 2,560 1,796 1,909
Acquisitions     650
Net Write - Offs (1,737) (1,609) (1,208)
Balance End of Year 4,416 3,593 3,406
Commercial Vehicle Inventory [Member]
      
2013      
Balance Beginning of Year 6,839 1,624 1,275
Net Charged to Costs and Expenses 13,020 12,944 5,807
Net Write - Offs (12,464) (7,729) (5,458)
Balance End of Year $ 7,395 $ 6,839 $ 1,624