Note 6 - Income Taxes - Current and Deferred Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 146,595	$ 85,855	$ 142,542
State and local	44,328	51,078	43,004
Current Income Tax Expense (Benefit)	190,923	136,933	185,546
Deferred:
Federal	23,544	172,334	43,900
State and local	(7,867)	2,755	9,520
Deferred Income Tax Expense (Benefit)	15,677	175,089	53,420
Total tax expense/(benefit)	$ 206,600	$ 312,022	$ 238,966