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Earnings per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ 6,501	$ 2,512	$ 65	$ 5,249
Net (Loss) Income, Diluted	$ 6,501	$ 2,512	$ 65	$ 5,249
Weighted Average Number of Shares Outstanding, Basic	1,994,177	2,008,688	1,994,175	2,008,593
Weighted Average Number of Shares Outstanding, Options	756,154	760,552	758,367	760,972
Weighted Average Number of Shares Outstanding, Diluted	2,750,331	2,769,240	2,752,542	2,769,565
Per Share Amount, Basic	$ 3.26	$ 1.25	$ 0.03	$ 2.61
Per Share Amount, Diluted	$ 2.36	$ 0.91	$ 0.02	$ 1.90

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