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Note 2 - Accounts Receivable (Details) - Accounts Receivable (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross $ 149,460 $ 138,438
Less: Allowance (152) (336)
Less: Long-term portion of accounts receivable, net (5,475) (4,953)
Total accounts receivable, net 143,833 133,149
Contracts in Transit [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross 72,315 65,597
Trade Accounts Receivable [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross 28,839 25,885
Vehicle Receivables [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross 21,895 21,298
Manufacturer Receivables [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross $ 26,411 $ 25,658