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Note 4 - Accounts Receivable (Details) - Accounts Receivable (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Warranty claims $ 10,616 $ 8,762
Other accounts receivable 23,700 22,104
Less allowance for bad debt and warranty receivable (1,240) (984)
Total 103,293 89,615
Trade Accounts Receivable From Sale of Vehicles [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 42,830 40,840
Trade Receivable Other Than Vehicles [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 27,387 $ 18,893