Note 7 - Income Taxes - Components of Income Tax Expense (Benefit) from Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Federal	$ 4,730	$ 3,369	$ 8,202	$ 9,574
State	642	198	1,188	538
Total current income tax expense	5,372	3,567	9,390	10,112
Federal	858	(1,507)	2,375	(2,653)
State	672	(476)	1,462	(1,279)
Total deferred income tax expense (benefit)	1,530	(1,983)	3,837	(3,932)
Change in valuation allowance	0	7	0	9
Total income tax expense	$ 6,902	$ 1,591	$ 13,227	$ 6,189