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Note 5 - Mineral Rights and Properties - Mineral Property Expenditures (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Mineral Property Expenditures $ 1,478,754 $ 956,564 $ 3,141,772 $ 3,803,338
Palangana Mine [Member]        
Mineral Property Expenditures 216,791 260,438 648,459 1,109,164
Goliad Project [Member]        
Mineral Property Expenditures 51,437 54,486 168,493 151,293
Burke Hollow Project [Member]        
Mineral Property Expenditures 626,695 154,672 942,311 1,024,345
Longhorn Project [Member]        
Mineral Property Expenditures 2,289 2,289 6,866 14,735
Salvo Project [Member]        
Mineral Property Expenditures 7,672 7,843 23,537 21,813
Anderson Project [Member]        
Mineral Property Expenditures 19,469 19,519 58,360 49,004
Workman Creek Project [Member]        
Mineral Property Expenditures 8,168 8,168 24,533 24,533
Slick Rock Project [Member]        
Mineral Property Expenditures 12,994 13,123 39,123 39,527
Reno Creek Project [Member]        
Mineral Property Expenditures 215,725 159,088 485,791 451,312
Yuty Project [Member]        
Mineral Property Expenditures 7,129 27,664 21,457 58,578
Oviedo Project [Member]        
Mineral Property Expenditures 109,676 69,446 256,091 298,505
Alto Parana Titanium Project [Member]        
Mineral Property Expenditures 88,796 36,323 134,710 202,656
Other Property Acquisitions [Member]        
Mineral Property Expenditures $ 111,913 $ 143,505 $ 332,041 $ 357,873