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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, 2019	Mar. 31, 2018
Basic shares (in shares)	6,418,242	6,188,861
Dilutive shares (in shares)	444,101	379,701
Diluted shares (in shares)	6,862,343	6,568,562
Net income (loss)	$ 1,234	$ 414
Basic net income per share (in dollars per share)	$ 0.19	$ 0.07
Diluted net income per share (in dollars per share)	$ 0.18	$ 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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