Note 14 - 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss)	$ (26,563)	$ (28,520)	$ 61,569
Series B Preferred Stock dividends declared	(552)	(552)	(552)
Net income (loss) applicable to common shares	$ (27,115)	$ (29,072)	$ 61,017
Weighted average number of common shares outstanding – basic (in shares)	433,419	397,394	386,416
Dilutive stock options, restricted stock units, and warrants (in shares)			2,906
Diluted weighted average common shares (in shares)	433,419	397,394	389,322
Basic (loss) income per common share after preferred dividends (in dollars per share)	$ (0.06)	$ (0.07)	$ 0.16
Diluted (loss) income per common share after preferred dividends (in dollars per share)	$ (0.06)	$ (0.07)	$ 0.16