Note 13 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal	$ 11,717	$ 13,614	$ 38,161
State	2,047	1,966	1,645
Foreign	4,460	3,588	5,701
Current	18,224	19,168	45,507
Federal	41,264	31,869	42,474
State	3,029	1,387	(3,134)
Foreign	(5,585)	(7,326)	(1,462)
Deferred	38,708	25,930	37,878
Change in valuation allowance	638	138	364
Provision for income taxes	$ 57,570	$ 45,236	$ 83,749