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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, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share Basic And Diluted [Abstract]
Basic shares									6,319,357	6,281,467
Dilutive shares									420,250	421,000
Diluted shares									6,739,607	6,702,467
Net income									$ 4,451	$ 2,707
Basic net income per share	$ 0.27	$ 0.13	$ 0.15	$ 0.15	$ 0.16	$ 0.07	$ 0.07	$ 0.13	$ 0.70	$ 0.43
Diluted net income per share	$ 0.25	$ 0.13	$ 0.14	$ 0.14	$ 0.15	$ 0.06	$ 0.06	$ 0.13	$ 0.66	$ 0.40

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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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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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