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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share Basic And Diluted [Abstract]
Basic shares	6,397,290	6,304,717	6,410,805	6,236,197
Dilutive shares	419,081	377,951	419,081	377,951
Diluted shares	6,816,371	6,682,668	6,829,886	6,614,148
Net income	$ 1,118	$ 240	$ 3,357	$ 1,013
Basic net income per share	$ 0.17	$ 0.04	$ 0.52	$ 0.17
Diluted net income per share	$ 0.16	$ 0.03	$ 0.49	$ 0.15

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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