Note 6 - Income Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic	$ (454)	$ 22,171	$ (10,702)
Foreign	(4,382)	(22,526)	(13,713)
Total current income tax benefit (provision)	(4,836)	(355)	(24,415)
Domestic	7,147	(30,766)	7,480
Foreign	4,390	10,158	(11,155)
Total deferred income tax benefit (provision)	11,537	(20,608)	(3,675)
Total benefit (provision)	$ 6,701	$ (20,963)	$ (28,090)