Note 13 - Net Loss Per Share - Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net loss	$ (15,004)	$ (14,709)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares)	10,118,682	5,644,328
Net loss per share, basic and diluted (in dollars per share)	$ (1.48)	$ (2.61)