Note 5 - (Loss) Income Per Common Share - Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Notes To Financial Statements [Abstract]
Net Income (Loss)	$ (15,694)	$ (13,523)	$ (18,867)	$ (9,370)
Preferred stock dividends	(138)	(138)	(276)	(276)
Net (loss) income applicable to common shares	$ (15,832)	$ (13,661)	$ (19,143)	$ (9,646)
Basic weighted average common shares (in shares)	604,088,000	539,401,000	602,077,000	538,943,000
Diluted weighted average common shares (in shares)	604,088,000	539,401,000	602,077,000	538,943,000
Basic (loss) income per common share (in dollars per share)	$ (0.03)	$ (0.03)	$ (0.03)	$ (0.02)
Diluted (loss) income per common share (in dollars per share)	$ (0.03)	$ (0.03)	$ (0.03)	$ (0.02)