Note 7 - Floor Plan Notes Payable And Lines Of Credit (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
(in Dollars)	$ 534,520,000	$ 520,693,000
(in Dollars)	534,520,000	520,693,000
Debt Instrument, Interest Rate During Period	1.42%	1.00%
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)	10,000,000
Line of Credit Facility, Amount Outstanding (in Dollars)	0
Line of Credit, Amount Pledged to Secure Letters of Credit (in Dollars)	7,400,000
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)	2,600,000
Inventory Loans up to $500 Million [Member]
Debt Instrument, Basis Spread on Variable Rate	2.23%
Inventory Loans Between $500 Million and $600 Million [Member]
Debt Instrument, Basis Spread on Variable Rate	2.95%
GE Capital Credit Agreement [Member]
Debt Instrument, Interest Rate at Period End	2.54%
Debt Instrument, Payment Terms	The credit agreement allows the Company to prepay inventory loans, provided that the prepayment does not exceed the sum of 38% of the aggregate inventory loans made up to $500.0 million plus 100% of the inventory loans above $500.0 million.
(in Dollars)	500,000,000
(in Dollars)	500,000,000
Ford Motor Financing Agreement [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Debt Instrument, Interest Rate at Period End	5.25%
(in Dollars)	34,500,000
Minimum Prime Rate Required	3.75%
(in Dollars)	$ 34,500,000