Note 12 - Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Years ended December 31,
	2021			2020
Net loss	$	(12,623	)	$	(15,004	)
Weighted average shares used to compute net loss per share, basic and diluted		16,917,664			10,118,682
Net loss per share, basic and diluted	$	(0.75	)	$	(1.48	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	December 31,
	2021		2020
Stock options to purchase common stock		1,649,686		1,114,306
Unvested restricted stock units		5,468		8,200
Common stock warrants		2,424,724		2,424,724
Total		4,079,878		3,547,230