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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share Basic And Diluted [Abstract]
Basic shares	6,328,794	6,276,001	6,316,598	6,279,079
Dilutive shares	421,000	422,000	421,000	422,000
Diluted shares	6,749,794	6,698,001	6,737,598	6,701,079
Net income	$ 953	$ 404	$ 1,903	$ 1,251
Basic net income per share	$ 0.15	$ 0.07	$ 0.30	$ 0.20
Diluted net income per share	$ 0.14	$ 0.06	$ 0.28	$ 0.19

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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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