Note 7 - Floor Plan Notes Payable and Lines of Credit - Assets Pledged as Collateral (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Inventories, new and used vehicles at cost based on specific identification, net of allowance	$ 1,429,429	$ 1,020,136
Total	3,821,066	3,119,977	$ 2,985,393
Floor Plan Notes Payable	933,203	630,731
Asset Pledged as Collateral [Member] | Floor Plan Notes Payable [Member]
Inventories, new and used vehicles at cost based on specific identification, net of allowance	1,034,727	711,358
Vehicle sale related accounts receivable	83,158	37,599
Total	$ 1,117,885	$ 748,957