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Note 7 - Equity-accounted Investment (Tables)
 6 Months Ended
Jan. 31, 2021
Notes Tables  
Equity Method Investments [Table Text Block]
   
Three Months Ended January 31,
   
Six Months Ended January 31,
 
   
2021
    
2020
    
2021
    
2020
  
Share of income (loss) from URC
  
$
600,913
    $
(23,653
 )  
$
(102,692
)
   $
(692,880
 )
Gain on ownership interest dilution
  
 
-
     
2,728,026
    
 
-
     
3,056,656
  
Total
  
$
600,913
    $
2,704,373
    
$
(102,692
)
   $
2,363,776
  
Balance, July 31, 2020
   $
11,515,327
  
Share of loss from URC
    
(102,692
 )
Translation gain
    
548,799
  
Balance, January 31, 2021
  
$
11,961,434