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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share Basic And Diluted [Abstract]
Basic shares	6,282,178	6,397,290	6,280,103	6,410,805
Dilutive shares	421,000	419,081	421,000	419,081
Diluted shares	6,703,178	6,816,371	6,701,103	6,829,886
Net income	$ 411	$ 1,118	$ 1,662	$ 3,357
Basic net income per share	$ 0.07	$ 0.17	$ 0.27	$ 0.52
Diluted net income per share	$ 0.06	$ 0.16	$ 0.25	$ 0.49

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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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