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Note 13 - Loss Per Share (Tables)
 9 Months Ended
Apr. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended April 30,
   
Nine Months Ended April 30,
 
   
2019
    
2018
    
2019
    
2018
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net Loss for the Period
  
$
(5,017,557
)
   $
(4,146,646
 )  
$
(10,818,657
)
   $
(13,056,299
 )
                                 
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic Weighted Average Number of Shares
  
 
179,348,614
     
157,704,601
    
 
174,213,254
     
155,996,660
  
Dilutive Stock Options and Warrants
  
 
-
     
-
    
 
-
     
-
  
Diluted Weighted Average Number of Shares
  
 
179,348,614
     
157,704,601
    
 
174,213,254
     
155,996,660
  
                                 
Net Loss per Share, Basic and Diluted
  
$
(0.03
)
   $
(0.03
 )  
$
(0.06
)
   $
(0.08
 )