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, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income (Loss)	$ (23,519)	$ 69,547	$ (86,968)
Series B Preferred Stock dividends declared	(552)	(552)	(552)
Net income (loss) applicable to common shares	$ (24,071)	$ 68,995	$ (87,520)
Weighted average number of common shares outstanding – basic (in shares)	397,394	386,416	373,954
Dilutive stock options, restricted stock units, and warrants (in shares)		2,906
Diluted weighted average common shares (in shares)	397,394	389,322	373,954
Basic (loss) income per common share after preferred dividends (in dollars per share)	$ (0.06)	$ 0.18	$ (0.23)
Diluted (loss) income per common share after preferred dividends (in dollars per share)	$ (0.06)	$ 0.18	$ (0.23)