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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Earnings Per Share [Abstract]    
Net income (loss) $ 744 $ (834)
Weighted average share outstanding:    
Basic 8,391,244 8,391,244
Common stock equivalents - treasury stock method 106,948  
Diluted 8,498,192 8,391,244
Basic $ 0.09 $ (0.10)
Diluted $ 0.09 $ (0.10)