Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Tax Expense (Benefit), Total	$ 23,223	$ (8,893)	$ 19,701	$ (3,708)
Effective Income Tax Rate Reconciliation, Percent, Total	15.50%	188.30%	13.90%	13.80%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	21.00%
Open Tax Year			2018 2019 2020 2021
Maximum [Member]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent			(1.00%)