Earnings per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - 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
Numerator:
NET INCOME	$ 1,871	$ 1,042	$ 1,192	$ (688)	$ 1,798	$ 1,328	$ 941	$ (317)	$ 3,417	$ 3,750
Denominator:
Common shares outstanding	18,149,356	18,198,567	18,159,029	18,207,165	18,033,548	17,921,552	17,827,591	17,617,099	18,207,396	17,852,968
Net Income per common share - basic
Net income	$ 0.10	$ 0.06	$ 0.07	$ (0.04)	$ 0.10	$ 0.07	$ 0.05	$ (0.02)	$ 0.19	$ 0.21
Weighted Average Shares:
Common shares outstanding	18,149,356	18,198,567	18,159,029	18,207,165	18,033,548	17,921,552	17,827,591	17,617,099	18,207,396	17,852,968
Common stock option grants									0	1,256,000
Total shares	18,297,058	18,310,772	18,213,617	18,207,165	18,460,503	18,181,157	17,934,141	17,617,099	18,398,788	18,158,659
Income per common share - diluted
Net income	$ 0.10	$ 0.06	$ 0.07	$ (0.04)	$ 0.10	$ 0.07	$ 0.05	$ (0.02)	$ 0.19	$ 0.21
Performance Related Awards [Member]
Weighted Average Shares:
Performance related awards/Restricted shares subject to vesting									0	191,247,000
Restricted Stock [Member]
Weighted Average Shares:
Performance related awards/Restricted shares subject to vesting									191,392,000	113,188,000