Note 15 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 41,686	$ 32,072	$ 15,753
State	4,211	9,639	1,775
Foreign	2,660	4,546	4,585
Current	48,557	46,257	22,113
Deferred:
Federal	19,393	22,225	18,213
State	1,390	1,910	4,139
Foreign	(1,263)	479	(2,777)
Deferred	19,520	24,614	19,575
Change in valuation allowance	(778)	(1,015)	2,454
Provision for income taxes	$ 67,299	$ 69,856	$ 44,142