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Geographic Information (Details) - USD ($)
9 Months Ended
Feb. 28, 2017
May 31, 2016
Geographic Information (Details) [Line Items]    
Property, Plant and Equipment, Net $ 368,332 $ 380,659
Geographic Concentration Risk [Member]    
Geographic Information (Details) [Line Items]    
Concentration Risk, Percentage 10.00%  
MEXICO    
Geographic Information (Details) [Line Items]    
Inventory, Gross $ 548,000 659,000
Property, Plant and Equipment, Net $ 18,000 $ 26,000