Note 12 - Net Loss Per Share - Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net loss	$ (12,623)	$ (15,004)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares)	16,917,664	10,118,682
Net loss per share, basic and diluted (in dollars per share)	$ (0.75)	$ (1.48)