Note 8 - 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, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income (loss)	$ 35,095	$ (9,457)	$ (94,909)
Preferred stock dividends	(552)	(552)	(552)
Income (loss) applicable to common stockholders	$ 34,543	$ (10,009)	$ (95,461)
Weighted average number of common shares outstanding – basic (in shares)	536,192	527,329	490,449
Dilutive stock options, restricted stock units, and warrants (in shares)	5,984	0	0
Diluted weighted average common shares (in shares)	542,176	527,329	490,449
Basic income (loss) per common share after preferred dividends (in dollars per share)	$ 0.06	$ (0.02)	$ (0.19)
Diluted income (loss) per common share after preferred dividends (in dollars per share)	$ 0.06	$ (0.02)	$ (0.19)