Note 7 - Income Taxes - Current and Deferred Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 142,542	$ 138,952	$ 87,977
State and local	43,004	28,094	20,981
Current income taxes, total	185,546	167,046	108,958
Deferred:
Federal	43,900	(2,392)	51,229
State and local	9,520	(4,664)	4,388
Deferred income taxes, total	53,420	(7,056)	55,617
Total tax expense/(benefit)	$ 238,966	$ 159,990	$ 164,575