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Note 17 - Segmented Information (Tables)
 12 Months Ended
Jul. 31, 2019
Notes Tables  
Long-lived Assets by Geographic Areas [Table Text Block]
   
July 31, 2019
  
Balance Sheet Items
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
    
Canada
 
  
Paraguay
 
 
  
Total
 
 
Mineral Rights and Properties
  
$
12,433,203
    
$
4,427,477
    
$
31,527,870
    
$
87,822
    
$
546,938
    
$
14,513,585
    
$
63,536,895
  
Property, Plant and Equipment
  
 
6,333,950
    
 
-
    
 
342,515
    
 
-
    
 
14,223
    
 
351,671
    
 
7,042,359
  
Restricted Cash
  
 
1,732,419
    
 
15,000
    
 
73,973
    
 
-
    
 
-
    
 
-
    
 
1,821,392
  
Equity-Accounted Investment
  
 
-
    
 
-
    
 
-
    
 
-
    
 
8,680,449
    
 
-
    
 
8,680,449
  
Other Long-Term Assets
  
 
221,214
    
 
-
    
 
28,000
    
 
-
    
 
-
    
 
-
    
 
249,214
  
Total Long-Term Assets
  
$
20,720,786
    
$
4,442,477
    
$
31,972,358
    
$
87,822
    
$
9,241,610
    
$
14,865,256
    
$
81,330,309
  
   
July 31, 2018
  
Balance Sheet Items
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
     Canada     Paraguay     Total  
Mineral Rights and Properties
   $
12,729,697
     $
11,069,018
     $
31,527,870
     $
735,468
     $
546,938
     $
14,513,585
     $
71,122,576
  
Property, Plant and Equipment
    
6,362,608
      
-
      
357,392
      
-
      
25,889
      
355,663
      
7,101,552
  
Reclamation Deposits
    
1,700,926
      
15,000
      
73,973
      
-
      
-
      
-
      
1,789,899
  
Equity-Accounted Investment
    
-
      
-
      
-
      
-
      
693,502
      
-
      
693,502
  
Other Long-Term Assets
    
416,519
      
-
      
146,533
      
-
      
-
      
-
      
563,052
  
Total Long-Term Assets
   $
21,209,750
     $
11,084,018
     $
32,105,768
     $
735,468
     $
1,266,329
     $
14,869,248
     $
81,270,581
  
Operating Results by Geographic Areas [Table Text Block]
   
Year ended July 31, 2019
  
Statement of Operations
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
    
Canada
 
  
Paraguay
 
  
Total
 
Costs and Expenses:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Mineral property expenditures
  
$
3,072,855
    
$
112,724
    
$
655,807
    
$
69,910
    
$
16,078
    
$
560,163
    
$
4,487,537
  
General and administrative
  
 
6,619,855
    
 
14,040
    
 
147,648
    
 
3,557
    
 
3,165,883
    
 
191,052
    
 
10,142,035
  
Depreciation, amortization and accretion
  
 
314,599
    
 
-
    
 
14,876
    
 
996
    
 
11,666
    
 
5,304
    
 
347,441
  
   
 
10,007,309
    
 
126,764
    
 
818,331
    
 
74,463
    
 
3,193,627
    
 
756,519
    
 
14,977,013
  
Loss from operations
  
 
(10,007,309
)
  
 
(126,764
)
  
 
(818,331
)
  
 
(74,463
)
  
 
(3,193,627
)
  
 
(756,519
)
  
 
(14,977,013
)
                                                         
Other income (expenses)
  
 
(3,337,331
)
  
 
(18,914
)
  
 
2,284
    
 
1,578,864
    
 
(432,598
)
  
 
17,547
    
 
(2,190,148
)
Loss before income taxes
  
$
(13,344,640
)
  
$
(145,678
)
  
$
(816,047
)
  
$
1,504,401
    
$
(3,626,225
)
  
$
(738,972
)
  
$
(17,167,161
)
   
Year ended July 31, 2018
  
Statement of Operations
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
     Canada     Paraguay     Total  
Costs and Expenses:
                                                        
Mineral property expenditures
   $
2,381,993
     $
100,296
     $
1,282,164
     $
67,550
     $
-
     $
720,148
     $
4,552,151
  
General and administrative
    
7,055,370
      
13,877
      
581,277
      
10,931
      
3,467,934
      
277,817
      
11,407,206
  
Depreciation, amortization and accretion
    
325,567
      
-
      
12,847
      
996
      
11,599
      
3,615
      
354,624
  
     
9,762,930
      
114,173
      
1,876,288
      
79,477
      
3,479,533
      
1,001,580
      
16,313,981
  
Loss from operations
    
(9,762,930
 )    
(114,173
 )    
(1,876,288
 )    
(79,477
 )    
(3,479,533
 )    
(1,001,580
 )    
(16,313,981
 )
                                                         
Other income (expenses)
    
(2,630,691
 )    
(18,914
 )    
1,541
      
-
      
423,657
      
4,243
      
(2,220,164
 )
Loss before income taxes
   $
(12,393,621
 )   $
(133,087
 )   $
(1,874,747
 )   $
(79,477
 )   $
(3,055,876
 )   $
(997,337
 )   $
(18,534,145
 )
   
Year ended July 31, 2017
  
Statement of Operations
  
United States
    
 
    
 
    
 
  
   
Texas
    
Arizona
    
Wyoming
    
Other States
     Canada     Paraguay     Total  
Costs and Expenses:
                                                        
Mineral property expenditures
   $
2,450,834
     $
101,628
     $
-
     $
70,588
     $
-
     $
1,497,338
     $
4,120,388
  
General and administrative
    
7,053,270
      
33,761
      
-
      
3,933
      
3,063,839
      
86,878
      
10,241,681
  
Depreciation, amortization and accretion
    
487,288
      
-
      
-
      
996
      
8,088
      
1,356
      
497,728
  
Impairment loss on mineral properties
    
185,942
      
8,334
      
-
      
103,666
      
-
      
-
      
297,942
  
Inventory write-down
    
60,694
      
-
      
-
      
-
      
-
      
-
      
60,694
  
     
10,238,028
      
143,723
      
-
      
179,183
      
3,071,927
      
1,585,572
      
15,218,433
  
Loss from operations
    
(10,238,028
 )    
(143,723
 )    
-
      
(179,183
 )    
(3,071,927
 )    
(1,585,572
 )    
(15,218,433
 )
                                                         
Other income (expenses)
    
(2,772,617
 )    
(18,914
 )    
-
      
-
      
636
      
3,917
      
(2,786,978
 )
Loss before income taxes
   $
(13,010,645
 )   $
(162,637
 )   $
-
     $
(179,183
 )   $
(3,071,291
 )   $
(1,581,655
 )   $
(18,005,411
 )