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Note 7 - Equity-accounted Investment (Tables)
9 Months Ended
Apr. 30, 2019
Notes Tables  
Equity Method Investments [Table Text Block]
Balance, July 31, 2018
  $
693,502
 
Share consideration received from sale of royalty interests
   
9,077,842
 
Share of loss from URC
   
(979,188
)
Gain on ownership interest dilution
   
388,369
 
Foreign currency translation
   
(121,722
)
Balance, April 30, 2019
 
$
9,058,803