Note 13 - Income (Loss) Per Common Share - Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 69,547	$ (86,968)	$ 17,824
Series B Preferred Stock dividends declared	(552)	(552)	(552)
Net income (loss) applicable to common shares	$ 68,995	$ (87,520)	$ 17,272
Weighted average number of common shares outstanding – basic (in shares)	386,416	373,954	353,442
Dilutive stock options, restricted stock units, and warrants (in shares)	2,906		3,993
Diluted weighted average common shares (in shares)	389,322	373,954	357,435
Basic income (loss) per common share after preferred dividends (in dollars per share)	$ 0.18	$ (0.23)	$ 0.05
Diluted income (loss) per common share after preferred dividends (in dollars per share)	$ 0.18	$ (0.23)	$ 0.05