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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator    
Net income $ 1,518 $ 2,658
Determination of shares    
Weighted-average common shares outstanding 5,118 5,211
Dilutive effect - share-based awards 12 18
Diluted weighted-average common shares outstanding 5,130 5,229
Earnings per common share    
Basic $ 0.30 $ 0.51
Diluted $ 0.30 $ 0.51