Note 5 - Income (Loss) Per Common Share - Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income (loss)	$ 18,971	$ (17,185)
Series B Preferred Stock dividends declared	(138)	(138)
Income (loss) applicable to common stockholders	$ 18,833	$ (17,323)
Weighted average number of common shares outstanding - basic (in shares)	534,101	523,215
Dilutive restricted stock units, warrants and deferred shares (in shares)	6,426	0
Diluted weighted average common shares (in shares)	540,527	523,215
Basic income (loss) per common share after preferred dividends (in dollars per share)	$ 0.04	$ (0.03)
Diluted income (loss) per common share after preferred dividends (in dollars per share)	$ 0.03	$ (0.03)