Note 4 - Mineral Rights and Properties - Mineral Property Expenditures (Details) - USD ($)	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Mineral Property Expenditures	$ 701,761	$ 1,523,451
Palangana Mine [Member]
Mineral Property Expenditures	198,802	320,027
Goliad Project [Member]
Mineral Property Expenditures	45,789	59,965
Burke Hollow Project [Member]
Mineral Property Expenditures	129,778	648,861
Longhorn Project [Member]
Mineral Property Expenditures	2,288	10,157
Salvo Project [Member]
Mineral Property Expenditures	8,192	7,269
Anderson Project [Member]
Mineral Property Expenditures	19,466	16,053
Workman Creek Project [Member]
Mineral Property Expenditures	8,198	8,198
Slick Rock Project [Member]
Mineral Property Expenditures	13,136	13,134
Reno Creek Project [Member]
Mineral Property Expenditures	100,490	148,043
Yuty Project [Member]
Mineral Property Expenditures	5,994	14,196
Oviedo Project [Member]
Mineral Property Expenditures	47,611	105,938
Alto Parana Titanium Project [Member]
Mineral Property Expenditures	16,451	56,248
Other Property Acquisitions [Member]
Mineral Property Expenditures	$ 105,566	$ 115,362