Note 6 - Income Taxes - Current and Deferred Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 85,855	$ 142,542	$ 138,952
State and local	51,078	43,004	28,094
Current Income Tax Expense (Benefit), Total	136,933	185,546	167,046
Deferred:
Federal	172,334	43,900	(2,392)
State and local	2,755	9,520	(4,664)
Deferred Income Tax Expense (Benefit), Total	175,089	53,420	(7,056)
Total tax expense/(benefit)	$ 312,022	$ 238,966	$ 159,990