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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		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ (1,455)	$ (170)
Net (Loss) Income, Diluted	$ (1,455)	$ (170)
Weighted Average Number of Shares Outstanding, Basic	1,994,197	1,995,174
Weighted Average Number of Shares Outstanding, Options		0
Weighted Average Number of Shares Outstanding, Diluted	1,994,197	1,995,174
Per Share Amount, Basic	$ (0.73)	$ (0.09)	$ (0.09)
Per Share Amount, Diluted	$ (0.73)	$ (0.09)	$ (0.09)

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