Note 9 - Net Income (Loss) Per Share of Common Stock - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income (loss)	$ (1,123)	$ 315	$ (2,819)	$ (3,315)
Basic (in shares)	23,174	22,823	23,139	22,685
Effect of stock -based awards (in shares)	0	317	0	0
Diluted weighted average common stock outstanding (in shares)	23,174	23,140	23,139	22,685
Basic net income (loss) per share (in dollars per share)	$ (0.05)	$ 0.01	$ (0.12)	$ (0.15)
Diluted net income (loss) per share (in dollars per share)	$ (0.05)	$ 0.01	$ (0.12)	$ (0.15)