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Note 7 - Equity-accounted Investment (Tables)
 12 Months Ended
Jul. 31, 2021
Notes Tables  
Equity Method Investments [Table Text Block]
Balance, July 31, 2019
   $
8,680,449
  
Loss from equity-accounted investment
    
(89,073
 )
Gain on ownership interest dilution
    
3,056,656
  
Translation loss
    
(132,705
 )
Balance, July 31, 2020
    
11,515,327
  
Addition
    
3,396,852
  
Income from equity-accounted investment
    
732,446
  
Gain on ownership interest dilution
    
4,471,558
  
Translation gain
    
613,491
  
Balance, July 31, 2021
  
$
20,729,674