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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income (loss)	$ 785	$ (14,028)	$ 19,756	$ (31,213)
Series B Preferred Stock dividends declared	(138)	(138)	(276)	(276)
Net income (loss) applicable to common shares	$ 647	$ (14,166)	$ 19,480	$ (31,489)
Weighted average number of common shares outstanding - basic (in shares)	535,531	525,243	534,819	524,218
Dilutive restricted stock units, warrants and deferred shares (in shares)	6,731	0	6,649	0
Diluted weighted average common shares (in shares)	542,262	525,243	541,468	524,218
Basic income (loss) per common share after preferred dividends (in cents) (in dollars per share)	$ 0.001	$ (0.027)	$ 0.036	$ (0.06)
Diluted income (loss) per common share after preferred dividends (in cents) (in dollars per share)	$ 0.001	$ (0.027)	$ 0.036	$ (0.06)