Note 10 - Net Loss Per Share - Basic and Diluted Common Shares (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Weighted average shares outstanding - basic and diluted (in shares)	126,314	118,382	123,835	118,322
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants (in shares)	0	0	0	0
Diluted (in shares)	126,314	118,382	123,835	118,322
Net loss per common share - basic and diluted (in dollars per share)	$ (0.13)	$ (0.13)	$ (0.27)	$ (0.19)