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Note 6 - Valuation and Allowance Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Trade Receivables [Member]      
Balance $ 639 $ 821 $ 540
Net Charged to Costs and Expenses 992 919 1,163
Net Write-Offs (1,125) (1,101) (882)
Balance End of Year 506 639 821
Allowance for Warranty Receivables From Manufacturers [Member]      
Balance 140 419 444
Net Charged to Costs and Expenses 1,677 411 626
Net Write-Offs (1,712) (690) (651)
Balance End of Year 105 140 419
Parts Inventory [Member]      
Balance 5,067 4,416 3,593
Net Charged to Costs and Expenses 4,215 2,547 2,560
Net Write-Offs (1,991) (1,896) (1,737)
Balance End of Year 7,291 5,067 4,416
Commercial Vehicle Inventory [Member]      
Balance 10,644 7,395 6,839
Net Charged to Costs and Expenses 8,417 7,877 5,517
Net Write-Offs (12,520) (4,628) (4,961)
Balance End of Year $ 6,541 $ 10,644 $ 7,395