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Note 14 - Net Loss Per Share (Tables)
 12 Months Ended
Jul. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended July 31,
 
   
2020
    
2019
    
2018
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
Net Loss for the Year
  
$
(14,610,516
)
   $
(17,152,789
 )   $
(17,826,634
 )
                         
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
Basic Weighted Average Number of Shares
  
 
183,041,766
      
175,844,624
      
157,123,025
  
Dilutive Stock Options, RSUs, PRSUs and Warrants
  
 
-
      
-
      
-
  
Diluted Weighted Average Number of Shares
  
 
183,041,766
      
175,844,624
      
157,123,025
  
                         
Net Loss per Share, Basic and Diluted
  
$
(0.08
)
   $
(0.10
 )   $
(0.11
 )