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Note 13 - Loss Per Share (Tables)
 6 Months Ended
Jan. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended January 31,
   
Six Months Ended January 31,
 
   
2019
    
2018
    
2019
    
2018
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net Loss for the Period
  
$
(2,349,674
)
   $
(4,353,813
 )  
$
(5,801,100
)
   $
(8,909,653
 )
                                 
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic Weighted Average Number of Shares
  
 
177,061,313
     
156,207,557
    
 
171,729,303
     
155,170,537
  
Dilutive Stock Options and Warrants
  
 
-
     
-
    
 
-
     
-
  
Diluted Weighted Average Number of Shares
  
 
177,061,313
     
156,207,557
    
 
171,729,303
     
155,170,537
  
                                 
Net Loss per Share, Basic and Diluted
  
$
(0.01
)
   $
(0.03
 )  
$
(0.03
)
   $
(0.06
 )