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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
May 31, 2019
Commitments and Contingencies Disclosure [Abstract]          
Right of use asset $ 477,363   $ 477,363   $ 540,433
Rent expense 45,000 $ 45,000 90,000 $ 90,000  
Lease amortization 34,493   68,305    
Lease interest expense $ 10,507   $ 21,695    
Discount rate 8.00%   8.00%    
2020 $ 90,000   $ 90,000    
2021 180,000   180,000    
2022 180,000   180,000    
2023 135,000   135,000    
Total 585,000   585,000    
Amount representing interest (107,637)   (107,637)    
Lease obligation, net 477,363   477,363    
Less current portion (133,940)   (133,940)   (128,705)
Lease obligation - long term 343,423   343,423   $ 411,729
Monthly base rent 15,000   $ 15,000    
Cash paid under operating lease $ 45,000