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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			6 Months Ended
	Jun. 30, 2019		Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ 5,775		$ (560)	$ 2,737	$ 2,726
Net (Loss) Income, Diluted	$ 5,775		$ (560)	$ 2,737	$ 2,726
Weighted Average Number of Shares Outstanding, Basic	2,026,119		2,097,737	2,031,569	2,119,343
Weighted Average Number of Shares Outstanding, Options	761,584	[1]		761,169	753,404
Weighted Average Number of Shares Outstanding, Diluted	2,787,702		2,097,737	2,792,738	2,872,747
Per Share Amount, Basic	$ 2.85		$ (0.27)	$ 1.35	$ 1.29
Per Share Amount, Diluted	$ 2.07		$ (0.27)	$ 0.98	$ 0.95
[1] The effect of the 767,500 outstanding stock option is anti-dilutive for the three months ended June 30, 2018 due to net loss for the period.

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