Note 11 - Net Loss Per Share - Calculation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net loss	$ (16,007)	$ (1,297)
Shares used to compute net loss per share - basic and diluted (in shares)	115,422,628	60,677,145
Net loss per share - basic and diluted (in dollars per share)	$ (0.14)	$ (0.02)