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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
	Mar. 31, 2021	Mar. 31, 2020
Net loss	$ (3,630)	$ (1,185)
Basic (in shares)	22,546	21,994
Effect of stock -based awards (in shares)	0	0
Diluted (in shares)	22,546	21,994
Basic net loss per share (in dollars per share)	$ (0.16)	$ (0.05)
Diluted net loss per share (in dollars per share)	$ (0.16)	$ (0.05)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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