Note 10 - Income Taxes - Provision for Federal and State Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal	$ 38,075	$ 26,785	$ 15,299
State	23,731	16,075	11,320
Total current	61,806	42,860	26,619
Federal	(1,197)	(1,349)	1,281
State	(798)	2,046	842
Total deferred	(1,995)	697	2,123
Change in valuation reserve	0	0	1,776
Provision for income taxes	59,811	43,557	30,518
Domestic Tax Authority [Member]
Change in valuation reserve	0	0	(472)
State and Local Jurisdiction [Member]
Change in valuation reserve	$ 0	$ 0	$ 2,248