Note 11 - Income Taxes - Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Domestic	$ (58,505)	$ (63,660)	$ (49,851)
Foreign	0	0	0
Loss from operations, before income taxes	$ (58,505)	$ (63,660)	$ (49,851)