Note 2 - Summary of Significant Accounting Policies - Calculation of Weighted Average Shares Used to Calculate Basic and Diluted (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic net loss per common share:
Net income (loss)	$ (3,991)	$ 8,087	$ (10,540)	$ (27,689)
Undistributed earnings allocated to participating securities - basic	0	2,969	0	0
Net Income (Loss) Available to Common Stockholders, Basic, Total	$ (3,991)	$ 5,118	$ (10,540)	$ (27,689)
Weighted average shares used in calculating basic (loss) income per share	48,709,846	12,100,292	28,634,209	7,902,104
Basic net (loss) income per common share	$ (0.08)	$ 0.42	$ (0.37)	$ (3.50)
Diluted net (loss) per common share:
Net loss	$ (3,991)	$ 8,087	$ (10,540)	$ (27,689)
Change in fair value of warrants	0	0	0	(5,119)
Undistributed earnings allocated to participating securities - diluted	0	(2,968)	0	0
Net loss attributable to common shares - diluted	$ (3,991)	$ 5,119	$ (10,540)	$ (32,808)
Weighted-average shares outstanding	48,709,846	12,100,292	28,634,209	7,902,104
Effect of potentially dilutive securities	0	6,479	0	50,894
Weighted average shares used in calculating diluted loss per share	48,709,846	12,106,771	28,634,209	7,952,998
Diluted net (loss) income per common share	$ (0.08)	$ 0.42	$ (0.37)	$ (4.13)