Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Expense (Benefit), Total	$ 39,414	$ (40,258)	$ 59,115	$ (43,966)
Effective Income Tax Rate Reconciliation, Percent, Total	20.60%	26.10%	17.80%	34.60%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			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%)