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Basis of Presentation - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share Basic And Diluted [Abstract]
Basic shares	6,307,227	6,280,593
Dilutive shares	421,000	422,000
Diluted shares	6,728,227	6,702,593
Net income	$ 950	$ 847
Basic net income per share	$ 0.15	$ 0.13
Diluted net income per share	$ 0.14	$ 0.13

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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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