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Note 3 - Mineral Rights and Properties (Tables)
6 Months Ended
Jan. 31, 2020
Notes Tables  
Schedule Of Mineral Rights and Property Acquisition Costs [Table Text Block]
   
January 31, 2020
   
July 31, 2019
 
Mineral Rights and Properties
 
 
 
 
 
 
 
 
Palangana Mine
 
$
6,027,784
    $
6,027,784
 
Goliad Project
 
 
8,689,127
     
8,689,127
 
Burke Hollow Project
 
 
1,495,750
     
1,495,750
 
Longhorn Project
 
 
116,870
     
116,870
 
Salvo Project
 
 
14,905
     
14,905
 
Anderson Project
 
 
3,470,373
     
3,470,373
 
Workman Creek Project
 
 
749,854
     
699,854
 
Los Cuatros Project
 
 
257,250
     
257,250
 
Slick Rock Project
 
 
30,000
     
-
 
Reno Creek Project
 
 
31,527,870
     
31,527,870
 
Diabase Project
 
 
546,938
     
546,938
 
Yuty Project
 
 
11,947,144
     
11,947,144
 
Oviedo Project
 
 
1,133,412
     
1,133,412
 
Alto Paraná Titanium Project
 
 
1,433,030
     
1,433,030
 
Other Property Acquisitions
 
 
91,080
     
91,080
 
   
 
67,531,387
     
67,451,387
 
Accumulated Depletion
 
 
(3,929,884
)
   
(3,929,884
)
   
 
63,601,503
     
63,521,503
 
                 
Databases
 
 
2,410,038
     
2,410,038
 
Accumulated Amortization
 
 
(2,409,686
)
   
(2,409,188
)
   
 
352
     
850
 
                 
Land Use Agreements
 
 
48,770
     
404,310
 
Accumulated Amortization
 
 
(44,020
)
   
(389,768
)
   
 
4,750
     
14,542
 
   
$
63,606,605
    $
63,536,895
 
Schedule Of Mineral Property Expenditures Incurred by Major Projects [Table Text Block]
   
Three Months Ended January 31,
   
Six Months Ended January 31,
 
   
2020
   
2019
   
2020
   
2019
 
Mineral Property Expenditures
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Palangana Mine
 
$
528,699
    $
246,592
   
$
848,726
    $
526,624
 
Goliad Project
 
 
36,843
     
19,056
   
 
96,807
     
37,878
 
Burke Hollow Project
 
 
220,812
     
166,469
   
 
869,673
     
275,014
 
Longhorn Project
 
 
2,289
     
10,157
   
 
12,446
     
25,533
 
Salvo Project
 
 
6,702
     
6,702
   
 
13,970
     
13,510
 
Anderson Project
 
 
13,433
     
15,056
   
 
29,486
     
37,270
 
Workman Creek Project
 
 
8,168
     
7,673
   
 
16,365
     
15,364
 
Slick Rock Project
 
 
13,271
     
12,206
   
 
26,405
     
29,430
 
Reno Creek Project
 
 
144,181
     
147,418
   
 
292,224
     
295,294
 
Yuty Project
 
 
16,718
     
62,600
   
 
30,914
     
86,003
 
Oviedo Project
 
 
123,117
     
40,758
   
 
229,055
     
61,483
 
Alto Paraná Titanium Project
 
 
110,085
     
34,429
   
 
166,333
     
60,262
 
Other Mineral Property Expenditures
 
 
99,005
     
130,101
   
 
214,370
     
301,795
 
   
$
1,323,323
    $
899,217
   
$
2,846,774
    $
1,765,460