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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 31, 2017
May 31, 2016
Earnings Per Share [Abstract]    
Net income $ 5 $ 1,678
Weighted average share outstanding:    
Basic 8,391,244 8,391,244
Common stock equivalents-treasury stock method 121,130  
Diluted 8,512,374 8,391,244
Basic $ 0.00 $ 0.20
Diluted $ 0.00 $ 0.20