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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic shares (in shares)	6,304,717	6,176,381	6,236,197	6,170,892
Dilutive shares (in shares)	377,951	320,501	377,951	320,501
Diluted shares (in shares)	6,682,668	6,496,882	6,614,148	6,491,393
Net income	$ 240	$ 635	$ 1,013	$ 1,455
Basic net income per share (in dollars per share)	$ 0.04	$ 0.10	$ 0.17	$ 0.24
Diluted net income per share (in dollars per share)	$ 0.03	$ 0.10	$ 0.15	$ 0.22

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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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