Note 3 - Mineral Rights and Properties - Mineral Property Expenditures (Details) - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Mineral Property Expenditures	$ 4,582,403	$ 4,487,537	$ 4,552,151
Revaluation of Asset Retirement Obligations		(274,195)
Palangana Mine [Member]
Mineral Property Expenditures	1,342,927	1,027,139	1,047,635
Revaluation of Asset Retirement Obligations		(274,195)
Goliad Project [Member]
Mineral Property Expenditures	190,278	96,789	105,264
Burke Hollow Project [Member]
Mineral Property Expenditures	1,130,467	1,616,601	675,605
Longhorn Project [Member]
Mineral Property Expenditures	17,023	45,848	14,401
Salvo Project [Member]
Mineral Property Expenditures	28,318	35,923	36,056
Anderson Project [Member]
Mineral Property Expenditures	71,170	81,414	68,167
Workman Creek Project [Member]
Mineral Property Expenditures	32,700	30,709	31,300
Slick Rock Project [Member]
Mineral Property Expenditures	52,521	53,843	52,218
Reno Creek Project [Member]
Mineral Property Expenditures	596,551	655,807	1,278,959
Yuty Project [Member]
Mineral Property Expenditures	65,679	102,882	425,298
Oviedo Project [Member]
Mineral Property Expenditures	350,211	288,324	119,082
Alto Parana Titanium Project [Member]
Mineral Property Expenditures	230,350	168,956	175,768
Other Property Acquisitions [Member]
Mineral Property Expenditures	$ 474,208	$ 557,497	$ 522,398