Note 8 - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax expense (benefit):
U.S. Federal	$ (32,272)	$ 17,086	$ 24,275
State	(34)	2,170	1,595
Foreign	11,411	9,925	7,085
Total current	(20,895)	29,181	32,955
Deferred tax expense (benefit):
U.S. Federal	(2,624)	12,237	(2,057)
State	179	(174)	(598)
Foreign	1,942	(196)	(1,575)
Total deferred	(503)	11,867	(4,230)
Total provision (benefit)	$ (21,398)	$ 41,048	$ 28,725