Note 13 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 32,072	$ 15,753	$ 11,717
State	9,639	1,775	2,047
Foreign	4,546	4,585	4,460
Current	46,257	22,113	18,224
Deferred:
Federal	22,225	18,213	40,213
State	1,910	4,139	3,029
Foreign	479	(2,777)	(5,585)
Deferred	24,614	19,575	37,657
Change in valuation allowance	(1,015)	2,454	638
Provision for income taxes	$ 69,856	$ 44,142	$ 56,519