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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share Basic And Diluted [Abstract]
Basic shares	6,276,001	6,423,642	6,279,079	6,420,653
Dilutive shares	422,000	427,282	422,000	427,282
Diluted shares	6,698,001	6,850,924	6,701,079	6,847,935
Net income	$ 404	$ 1,005	$ 1,251	$ 2,239
Basic net income per share	$ 0.07	$ 0.16	$ 0.20	$ 0.35
Diluted net income per share	$ 0.06	$ 0.15	$ 0.19	$ 0.33

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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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