Note 7 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal	$ 2,047	$ (23,784)	$ 11,184
State	(1,588)	(2,265)	1,310
Foreign	64	100
Total current provision	523	(25,949)	12,494
Federal	(122,302)	(248,279)	31,978
State	(8,864)	(20,553)	2,036
Foreign	1,633	(4,312)	(829)
Total deferred provision	(129,533)	(273,144)	33,185
Provision for income taxes	$ (129,010)	$ (299,093)	$ 45,679