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CAPITAL STOCK AND ADDITIONAL PAID-IN CAPITAL - (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 23, 2020
USD ($)
shares
Sep. 22, 2020
$ / shares
Sep. 22, 2020
USD ($)
$ / shares
shares
Apr. 30, 2022
USD ($)
Apr. 30, 2021
USD ($)
Oct. 31, 2020
USD ($)
Jan. 31, 2022
USD ($)
$ / shares
shares
Apr. 30, 2022
$ / shares
Apr. 30, 2022
USD ($)
$ / shares
shares
Apr. 30, 2021
USD ($)
Jul. 31, 2021
$ / shares
shares
Jul. 31, 2020
$ / shares
shares
Apr. 30, 2022
USD ($)
Jul. 31, 2021
USD ($)
Sep. 23, 2020
$ / shares
Sep. 23, 2020
$ / shares
Jul. 31, 2019
$ / shares
Capital Stock And Additional Paid In Capital [Line Items]                                  
Proceeds from issuance of private placement                 $ 2,392,998 $ 248,198              
Warrant exercise price | $ / shares               $ 0.95     $ 1.14 $ 1.27         $ 1.57
Legal fees       $ 128,605 $ 131,488       399,351 323,788              
Share-based compensation       $ 406,790 $ 0 $ 560,792     $ 406,790 560,792              
Number of options granted | shares                 805,000   1,338,500            
Weighted average exercise price of options granted | $ / shares               0.82     $ 1.2            
Aggregate intrinsic value of options                         $ 6,000 $ 1,313      
Number of warrants expired unexercised | shares                 488,438   5,787,286 1,402,393          
Weighted average exercise price of warrants expired | $ / shares               1.2     $ 1.3 $ 2.5          
Non-brokered private placement [Member]                                  
Capital Stock And Additional Paid In Capital [Line Items]                                  
Proceeds from issuance of private placement $ 250,000           $ 2,407,000                    
Number of units in non-brokered private placement | shares 333,333           6,017,500                    
Sale of stock, price per share | (per share)             $ 0.4               $ 1.02 $ 0.75  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date Sep. 21, 2022           Jan. 28, 2024                    
Warrant exercise price | (per share)             $ 0.6               $ 1.36 $ 1  
Legal fees $ 1,802           $ 14,002                    
President and CEO [Member]                                  
Capital Stock And Additional Paid In Capital [Line Items]                                  
Number of options granted | shares     1,338,500                            
Weighted average exercise price of options granted | (per share)   $ 1.2 $ 0.9                            
Share based compensation expense     $ 560,792                            
Director [Member] | Non-brokered private placement [Member]                                  
Capital Stock And Additional Paid In Capital [Line Items]                                  
Proceeds from issuance of private placement             830,000                    
Purchase unit of private placement             $ 2,075,000                    
Stock option [Member] | Executive officers and directors, employees and consultants [Member]                                  
Capital Stock And Additional Paid In Capital [Line Items]                                  
Stock option acquisition percentage                 10.00%                
Maximum term of option granted                 5 years                
Stock option [Member] | Employees, officers and directors [Member]                                  
Capital Stock And Additional Paid In Capital [Line Items]                                  
Maximum term of option granted                 5 years                
Share-based compensation                 $ 406,790 $ 560,792              
Number of options granted | shares                 805,000                
Weighted average exercise price of options granted | (per share)               $ 0.82 $ 0.65