Note 15 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 105,236	$ 62,714	$ 41,686
State	21,295	13,071	4,211
Foreign	10,536	1,974	2,660
Current Income Tax Expense (Benefit), Total	137,067	77,759	48,557
Deferred:
Federal	10,518	20,452	19,393
State	(3,728)	1,243	1,390
Foreign	(7,863)	(1,197)	(1,263)
Deferred Income Tax Expense (Benefit) Before Adjustment of Valuation Allowance	(1,073)	20,498	19,520
Change in valuation allowance	(1,037)	716	(778)
Provision for income taxes	$ 134,957	$ 98,973	$ 67,299