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Note 17 - Segmented Information (Tables)
 12 Months Ended
Jul. 31, 2021
Notes Tables  
Long-lived Assets by Geographic Areas [Table Text Block]
   
July 31, 2021
  
Balance Sheet Items
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
    
Canada
 
  
Paraguay
 
  
Total
 
Mineral Rights and Properties
  
$
12,421,161
    
$
4,627,477
    
$
31,527,870
    
$
146,971
    
$
546,938
    
$
14,513,586
    
$
63,784,003
  
Property, Plant and Equipment
  
 
6,645,905
    
 
-
    
 
312,763
    
 
-
    
 
34,036
    
 
365,333
    
 
7,358,037
  
Restricted Cash
  
 
1,948,704
    
 
15,000
    
 
73,973
    
 
-
    
 
-
    
 
-
    
 
2,037,677
  
Equity-Accounted Investment
  
 
-
    
 
-
    
 
-
    
 
-
    
 
20,729,674
    
 
-
    
 
20,729,674
  
Other Non-Current Assets
  
 
522,306
    
 
-
    
 
16,000
    
 
-
    
 
48,026
    
 
-
    
 
586,332
  
Total Long-Term Assets
  
$
21,538,076
    
$
4,642,477
    
$
31,930,606
    
$
146,971
    
$
21,358,674
    
$
14,878,919
    
$
94,495,723
  
   
July 31, 2020
  
Balance Sheet Items
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
    
Canada
    
Paraguay
    
Total
  
Mineral Rights and Properties
   $
12,422,661
     $
4,527,477
     $
31,527,870
     $
116,971
     $
546,938
     $
14,513,586
     $
63,655,503
  
Property, Plant and Equipment
    
6,299,786
      
-
      
327,639
      
-
      
29,677
      
362,715
      
7,019,817
  
Restricted Cash
    
1,750,243
      
15,000
      
73,973
      
-
      
-
      
-
      
1,839,216
  
Equity-Accounted Investment
    
-
      
-
      
-
      
-
      
11,515,327
      
-
      
11,515,327
  
Other Non-Current Assets
    
703,312
      
-
      
22,000
      
-
      
44,563
      
-
      
769,875
  
Total Long-Term Assets
   $
21,176,002
     $
4,542,477
     $
31,951,482
     $
116,971
     $
12,136,505
     $
14,876,301
     $
84,799,738
  
Operating Results by Geographic Areas [Table Text Block]
   
Year ended July 31, 2021
  
Statement of Operations
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
    
Canada
 
  
Paraguay
 
  
Total
 
Costs and Expenses:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Mineral property expenditures
  
$
3,002,300
    
$
125,241
    
$
672,225
    
$
69,075
    
$
7,752
    
$
602,214
    
$
4,478,807
  
General and administrative
  
 
9,596,400
    
 
15,317
    
 
86,211
    
 
1,830
    
 
2,894,424
    
 
45,816
    
 
12,639,998
  
Depreciation, amortization and accretion
  
 
357,600
    
 
-
    
 
14,876
    
 
-
    
 
16,870
    
 
3,827
    
 
393,173
  
Loss from operations
  
 
(12,956,300
)
  
 
(140,558
)
  
 
(773,312
)
  
 
(70,905
)
  
 
(2,919,046
)
  
 
(651,857
)
  
 
(17,511,978
)
                                                         
Other income (expenses)
  
 
(2,541,515
)
  
 
(18,914
)
  
 
(9,982
)
  
 
-
    
 
5,259,464
    
 
5,107
    
 
2,694,160
  
Loss before income taxes
  
$
(15,497,815
)
  
$
(159,472
)
  
$
(783,294
)
  
$
(70,905
)
  
$
2,340,418
    
$
(646,750
)
  
$
(14,817,818
)
   
Year ended July 31, 2020
  
Statement of Operations
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
     Canada     Paraguay     Total  
Costs and Expenses:
                                                        
Mineral property expenditures
   $
3,165,898
     $
104,191
     $
596,551
     $
69,523
     $
-
     $
646,240
     $
4,582,403
  
General and administrative
    
6,982,684
      
13,717
      
112,193
      
2,277
      
2,272,138
      
58,889
      
9,441,898
  
Depreciation, amortization and accretion
    
273,687
      
-
      
14,876
      
850
      
11,959
      
8,850
      
310,222
  
Loss from operations
    
(10,422,269
 )    
(117,908
 )    
(723,620
 )    
(72,650
 )    
(2,284,097
 )    
(713,979
 )    
(14,334,523
 )
                                                         
Other income (expenses)
    
(3,417,783
 )    
(18,965
 )    
2,095
      
-
      
3,147,724
      
5,385
      
(281,544
 )
Loss before income taxes
   $
(13,840,052
 )   $
(136,873
 )   $
(721,525
 )   $
(72,650
 )   $
863,627
     $
(708,594
 )   $
(14,616,067
 )