Note 5 - Mineral Rights and Properties - Mineral Property Expenditures (Details) - USD ($)	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Mineral Property Expenditures
Mineral Property Expenditures	$ 4,487,537	$ 4,552,151	$ 4,120,388
Revaluation of Asset Retirement Obligations	(274,195)		(187,255)
Palangana Mine [Member]
Mineral Property Expenditures
Mineral Property Expenditures	1,027,139	1,047,635	880,633
Goliad Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	96,789	105,264	114,286
Burke Hollow Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	1,616,601	675,605	1,020,965
Longhorn Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	45,848	14,401	32,796
Salvo Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	35,923	36,056	37,551
Anderson Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	81,414	68,167	68,303
Workman Creek Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	30,709	31,300	31,265
Slick Rock Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	53,843	52,218	44,231
Reno Creek Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	655,807	1,278,959
Yuty Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	102,882	425,298	365,517
Oviedo Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	288,324	119,082	331,798
Alto Parana Titanium Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	168,956	175,768	800,023
Other Property Acquisitions [Member]
Mineral Property Expenditures
Mineral Property Expenditures	$ 557,497	$ 522,398	$ 580,275