Note 9 - Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Taxes.
Deferred income taxes			$ 6,620	$ 6,448
Income tax expense	$ 2,467	$ 9,818	$ 8,016	$ 20,472
Effective Income Tax Rate Reconciliation, Percent, Total	24.60%	22.80%	19.60%	21.50%
Statutory rate			21.00%