Note 7 - Floor Plan Notes Payable and Lines of Credit (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Line of Credit Facility, Maximum Borrowing Capacity	$ 15,000
Floor Plan Notes Payable	630,731	$ 511,786
Long-term Line of Credit, Total	0
Line of Credit Amount Pledged to Secure Letters of Credit	14,300
Line of Credit Facility, Remaining Borrowing Capacity	$ 700
Floor Plan Credit Agreement [Member]
Debt Instrument, Interest Rate, Effective Percentage	1.20%
Floor Plan Notes Payable	$ 549,000
Debt, Weighted Average Interest Rate	0.42%	1.26%
BMO Harris Bank N.A. [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000,000
BMO Harris Bank N.A. [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.10%