Note 3 - Income Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Current:
Domestic		$ 2,506	$ (12,798)
Foreign	15,935	1,627	21,451	2,642
Total current income tax provision (benefit)	15,935	4,133	8,653	2,642
Deferred:
Domestic	2,965	8,777	(15,939)	9,365
Foreign	(2,805)	(1,414)	(5,690)	1,143
Total deferred income tax benefit	160	7,363	(21,629)	10,508
Total income tax provision (benefit)	$ 16,095	$ 11,496	$ (12,976)	$ 13,150