Note 3 - Income Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Current:
Domestic		$ 4,123	$ (12,797)	$ 4,122
Foreign	(3,959)	5,773	17,491	8,416
Total current income tax (benefit) provision	(3,959)	9,896	4,694	12,538
Deferred:
Domestic	1,980	(5,723)	(13,958)	3,642
Foreign	(3,422)	5,280	(9,113)	6,423
Total deferred income tax (benefit) provision	(1,442)	(443)	(23,071)	10,065
Total income tax (benefit) provision	$ (5,401)	$ 9,453	$ (18,377)	$ 22,603