Note 2 - Accounts Receivable (Details) - Accounts Receivable (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	$ 147,174	$ 138,438
Less: Allowance	(153)	(336)
Less: Long-term portion of accounts receivable, net	(6,935)	(4,953)
Total accounts receivable, net	140,086	133,149
Contracts in Transit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	66,516	65,597
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	33,252	25,885
Vehicle Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	22,308	21,298
Manufacturer Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, gross	$ 25,098	$ 25,658