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Note 5 - Property, Plant and Equipment (Tables)
 9 Months Ended
Apr. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
April 30, 2019
    
July 31, 2018
  
   
Cost
   
Accumulated
Depreciation
   
Net Book
Value
   
Cost
    
Accumulated
Depreciation
    
Net Book
Value
  
Hobson Processing Facility
  
$
6,819,088
   
$
(773,933
)
  
$
6,045,155
     $
6,819,088
     $
(773,933
 )   $
6,045,155
  
Mining Equipment
  
 
2,467,557
   
 
(2,396,991
)
  
 
70,566
      
2,438,681
      
(2,412,277
 )    
26,404
  
Logging Equipment and Vehicles
  
 
1,851,883
   
 
(1,742,816
)
  
 
109,067
      
1,971,742
      
(1,850,306
 )    
121,436
  
Computer Equipment
  
 
589,051
   
 
(559,229
)
  
 
29,822
      
607,342
      
(577,584
 )    
29,758
  
Furniture and Fixtures
  
 
170,701
   
 
(169,238
)
  
 
1,463
      
170,701
      
(168,814
 )    
1,887
  
Land and Buildings
  
 
889,606
   
 
(23,851
)
  
 
865,755
      
889,606
      
(12,694
 )    
876,912
  
   
$
12,787,886
   
$
(5,666,058
)
  
$
7,121,828
     $
12,897,160
     $
(5,795,608
 )   $
7,101,552