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Geographic Information (Details) - USD ($)
3 Months Ended
Aug. 31, 2019
May 31, 2019
Geographic Information (Details) [Line Items]    
Property, Plant and Equipment, Net $ 323,743 $ 351,070
Customer Concentration Risk [Member]    
Geographic Information (Details) [Line Items]    
Concentration Risk, Percentage 10.00%  
MEXICO    
Geographic Information (Details) [Line Items]    
Inventory, Gross $ 667,000 665,000
Property, Plant and Equipment, Net $ 37,000 $ 39,000