Note 5 - Loss Per Common Share - Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Notes To Financial Statements [Abstract]
Net Income (Loss)	$ (5,753)	$ (3,173)
Preferred stock dividends	(138)	(138)
Net loss applicable to common stockholders	$ (5,891)	$ (3,311)
Basic weighted average common shares	616,199	600,075
Diluted weighted average common shares	616,199	600,075
Basic loss per common share	$ (0.01)	$ (0.01)
Diluted loss per common share	$ (0.01)	$ (0.01)