Note 5 - Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 18,872	$ 21,312	$ (1,210)
State	3,367	3,498	1,782
Total current	22,239	24,810	572
Deferred:
Federal	3,462	(1,557)	15,572
State	603	633	473
Total deferred	4,065	(924)	16,045
Total expense (benefit)	$ 26,304	$ 23,886	$ 16,617