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Note 13 - Capital Stock - Summary of Stock-based Compensation Expense (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 30, 2022
Jan. 31, 2022
Oct. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Oct. 31, 2020
Apr. 30, 2022
Apr. 30, 2021
Share-Based Payment Arrangement, Noncash Expense, Total $ 951,395     $ 1,167,727     $ 3,526,261 $ 3,764,300
Common stock issued 344,261 $ 399,448 $ 355,228 308,131 $ 328,362 $ 265,590    
Consultants [Member]                
Common stock issued to consultants 158,313     229,047     664,015 468,364
Amortization of expenses 37,130     54,593     173,705 224,295
Share-Based Payment Arrangement, Noncash Expense, Total 195,443     283,640     837,720 692,659
Management [Member]                
Amortization of expenses 91,033     154,531     382,190 614,579
Share-Based Payment Arrangement, Noncash Expense, Total 346,966     455,045     1,162,454 1,533,849
Management [Member] | Restricted Stock Units (RSUs) and Performance Restricted Stock Units (PRSUs) [Member]                
Amortization of expenses 255,933     300,514     780,264 919,270
Employees [Member]                
Amortization of expenses 127,190     164,558     632,284 798,796
Share-Based Payment Arrangement, Noncash Expense, Total 408,986     429,042     1,526,087 1,537,792
Common stock issued $ 281,796     $ 264,484     $ 893,803 $ 738,996