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Note 2 - Basis of Presentation - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic shares (in shares)	6,188,861	6,158,399
Dilutive shares (in shares)	379,701	320,500
Diluted shares (in shares)	6,568,562	6,478,899
Net income	$ 414	$ 404
Basic net income per share (in dollars per share)	$ 0.07	$ 0.07
Diluted net income per share (in dollars per share)	$ 0.06	$ 0.06

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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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