Note 10 - Income Taxes - Provision for Federal and State Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal	$ 15,299	$ 15,982	$ 11,570
State	11,320	10,654	9,595
Total current	26,619	26,636	21,165
Federal	1,281	(538)	2,411
State	842	292	982
Total deferred	2,123	(246)	3,393
Change in valuation reserve	1,776	0	269
Provision for income taxes	30,518	26,390	24,827
Domestic Tax Authority [Member]
Change in valuation reserve	(472)	0	(71)
State and Local Jurisdiction [Member]
Change in valuation reserve	$ 2,248	$ 0	$ 340