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Note 9 - Net Loss Per Share of Common Stock - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net loss	$ (1,512)	$ (2,090)	$ (3,809)	$ (4,272)
Basic weighted-average common stock outstanding (in shares)	21,936	22,129	21,927	22,139
Effect of stock -based awards (in shares)
Diluted weighted average common stock outstanding (in shares)	21,936	22,129	21,927	22,139
Basic net loss per share (in dollars per share)	$ (0.07)	$ (0.09)	$ (0.17)	$ (0.19)
Diluted net loss per share (in dollars per share)	$ (0.07)	$ (0.09)	$ (0.17)	$ (0.19)

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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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