Note 9 - Net Loss Per Share of Common Stock - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net loss	$ (1,185)	$ (2,297)
Basic (in shares)	22,421	21,917
Effect of stock -based awards (in shares)
Diluted (in shares)	22,421	21,917
Basic net loss per share (in dollars per share)	$ (0.05)	$ (0.10)
Diluted net loss per share (in dollars per share)	$ (0.05)	$ (0.10)