Note 3 - Income Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Current:
Domestic	$ 1		$ 1	$ (12,798)
Foreign	2,965	15,935	4,171	21,451
Total current income tax provision (benefit)	2,966	15,935	4,172	8,653
Deferred:
Domestic		2,965		(15,939)
Foreign	(2,539)	(2,805)	(2,977)	(5,690)
Total deferred income tax provision (benefit)	(2,539)	160	(2,977)	(21,629)
Total income tax provision (benefit)	$ 427	$ 16,095	$ 1,195	$ (12,976)