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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			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic shares (in shares)	6,423,642		6,195,801	6,420,653	6,192,117
Dilutive shares (in shares)	427,282		378,701	427,282	378,701
Diluted shares (in shares)	6,850,924		6,574,502	6,847,935	6,570,818
Net income (loss)	$ 1,005	$ 359	$ 359	$ 2,239	$ 773
Basic net income per share (in dollars per share)	$ 0.16	$ 0.06	$ 0.06	$ 0.35	$ 0.13
Diluted net income per share (in dollars per share)	$ 0.15	$ 0.06	$ 0.06	$ 0.33	$ 0.12

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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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