Note 10 - Income Taxes - Components of Income Tax Expense (Benefit) from Operations (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Federal													$ 22,405	$ 13,292	$ 15,474
State													2,962	2,059	908
Total current income tax expense													25,367	15,351	16,382
Federal													(513)	3,318	(5,398)
State													2,336	2,176	(2,082)
Total deferred income tax expense (benefit)													1,823	5,494	(7,480)
Change in valuation allowance													0	(93)	(28)
Total income tax expense	$ 9,174	$ 9,024	$ 7,547	$ 1,445	$ 7,525	$ 6,902	$ 864	$ 5,461	$ 2,685	$ 1,591	$ 2,348	$ 2,250	$ 27,190	$ 20,752	$ 8,874