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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share Basic And Diluted [Abstract]
Basic shares									6,281,467	6,386,946
Dilutive shares									421,000	412,800
Diluted shares									6,702,467	6,799,746
Net income									$ 2,707	$ 4,566
Basic net income per share	$ 0.16	$ 0.07	$ 0.07	$ 0.13	$ 0.19	$ 0.17	$ 0.16	$ 0.19	$ 0.43	$ 0.71
Diluted net income per share	$ 0.15	$ 0.06	$ 0.06	$ 0.13	$ 0.18	$ 0.16	$ 0.15	$ 0.18	$ 0.40	$ 0.67

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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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