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Geographic Information (Details) - USD ($)
3 Months Ended
Aug. 31, 2016
May 31, 2016
Geographic Information (Details) [Line Items]    
Property, Plant and Equipment, Net $ 343,688 $ 380,659
MEXICO    
Geographic Information (Details) [Line Items]    
Inventory, Gross 592,000 659,000
Property, Plant and Equipment, Net $ 23,000 $ 26,000
Geographic Concentration Risk [Member]    
Geographic Information (Details) [Line Items]    
Concentration Risk, Percentage 10.00%