Note 11 - Net Loss Per Share Attributable to Common Stockholders - Basic and Diluted Common Shares (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Weighted average shares outstanding - basic and diluted (in shares)	130,136	119,201
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants (in shares)	0	0
Diluted (in shares)	130,136	119,201
Net loss per common share - basic and diluted (in dollars per share)	$ (0.65)	$ (0.34)