Note 2 - Summary of Significant Accounting Policies - Basic and Diluted Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net income (loss)	$ 9,282	$ (7,253)
Preferred dividends, deemed dividends and accretion	(8,116)	(3,695)
Net income (loss) available to common shareholders	1,166	(10,948)
Preferred dividends, deemed dividends and accretion	0	0
Net income (loss) available to common shareholders after assumed conversions	$ 1,166	$ (10,948)
Denominator for basic income (loss) per share – weighted-average shares outstanding (in shares)	312,119,417	133,346,309
Options (in shares)	5,750,000	0
Warrants (in shares)	2,787,311	0
Convertible preferred stock (in shares)	0	0
Denominator for diluted income (loss) – adjusted weighted average shares and assumed conversions (in shares)	320,656,728	133,346,309
Basic income (loss) per share available to common shareholders (in dollars per share)	$ 0.00	$ (0.08)
Diluted income (loss) per share available to common shareholders (in dollars per share)	$ 0.00	$ (0.08)