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9. Short-term notes (Details Narrative) - USD ($)
9 Months Ended 12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
May 31, 2018
Proceeds from issuance of short term debt $ 4,259,800 $ 995,140  
2017 Notes [Member]      
Debt issuance date     Oct. 15, 2017
Debt face amount     $ 995,140
Debt stated interest rate     6.00%
Short term debt repaid $ 995,140    
2018 Notes 10% [Member]      
Debt stated interest rate 10.00%    
Proceeds from issuance of short term debt $ 3,030,000    
2018 Notes 8% [Member]      
Proceeds from issuance of short term debt 1,154,800    
Accrued incentives 51,314    
2019 Notes 10% [Member]      
Proceeds from issuance of short term debt $ 75,000