Note 8 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal, Current	$ 5,987	$ (16,705)	$ (20,718)
State, Current	3	(42)	(139)
Foreign, Current	3,400	3,347	5,436
Current Income Tax Expense	9,390	(13,400)	(15,421)
Federal, deferred	(21,466)	(60,750)	(47,692)
State, deferred	(1,404)	(172)	(446)
Foreign, deferred	133	(84)	90
Deferred Income Tax Benefit	(22,737)	(61,006)	(48,048)
Income Tax Benefit	$ (13,347)	$ (74,406)	$ (63,469)