Note 9 - Earnings (Loss) Per Share Applicable to Common Stockholders - Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income (loss) - basic	$ (636)	$ 19,764	$ 70	$ (373)
Reversal of gain due to change in fair value of warrant liability	0	(19,274)	(352)	0
Net income (loss) - diluted	$ (636)	$ 490	$ (282)	$ (373)
Weighted average shares outstanding - basic (in shares)	212,051,322	202,033,912	211,532,305	198,606,970
Diluted stock options (in shares)	0	5,437,099	0	0
Diluted warrants (in shares)	0	31,442,211	0	0
Diluted preferred shares (in shares)	0	39,492,302	31,268,169	0
Weighted average shares outstanding - diluted (in shares)	212,051,322	278,405,524	242,800,475	198,606,970
Basic earnings (loss) per share (in dollars per share)	$ (0.00)	$ 0.10	$ 0.00	$ (0.00)
Diluted earnings (loss) per share (in dollars per share)	$ (0.00)	$ 0.00	$ (0.00)	$ (0.00)