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Property, Plant and Equipment (Details Narrative) - USD ($)
6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
May 31, 2019
Property, Plant and Equipment [Line Items]      
Machinery and equipment $ 7,861,233   $ 7,861,233
Estimated useful life 3 years 6 months    
Carrying value of assets $ 42,282,402   $ 43,167,212
Depreciation expense 2,557,936 $ 2,131,971  
Two Plant Buildings and Land [Member]      
Property, Plant and Equipment [Line Items]      
Carrying value of assets 2,838,613    
Service [Member]      
Property, Plant and Equipment [Line Items]      
Machinery and equipment $ 923,063    
Molding Machines [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 12 years