Note 10 - Net Loss Per Share - Basic and Diluted Common Shares (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Weighted average shares outstanding - basic and diluted (in shares)	146,931	121,328
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants (in shares)	0	0
Diluted (in shares)	146,931	121,328
Net loss per common share - basic and diluted (in dollars per share)	$ (0.23)	$ (0.14)