Note 1 - Organization, Nature of Business and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net loss	$ (118,371)	$ (106,390)	$ (291,116)	$ (428,412)	$ (321,742)	$ (455,016)	$ (65,121)	$ (30,663)	$ (944,289)	$ (872,542)	$ 68,823
Weighted average common shares outstanding - basic (in shares)									118,305	102,853	53,838
Weighted average common shares outstanding - diluted (in shares)									118,305	102,853	56,513
Basic (in dollars per share)	$ (1)	$ (0.90)	$ (2.46)	$ (3.65)	$ (2.75)	$ (3.89)	$ (0.56)	$ (0.51)	$ (7.98)	$ (8.48)	$ 1.28
Diluted (in dollars per share)	$ (1)	$ (0.90)	$ (2.46)	$ (3.65)	$ (2.75)	$ (3.89)	$ (0.56)	$ (0.51)	$ (7.98)	$ (8.48)	$ 1.22
Employee Stock Option [Member]
Potentially dilutive common shares (in shares)											2,245
Restricted Stock [Member]
Potentially dilutive common shares (in shares)											430