Note 4 - Mineral Rights and Properties - Mineral Property Expenditures (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Mineral Property Expenditures
Mineral Property Expenditures	$ 899,217	$ 980,215	$ 1,765,460	$ 2,656,915
Palangana Mine [Member]
Mineral Property Expenditures
Mineral Property Expenditures	246,592	237,215	526,624	476,530
Goliad Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	19,056	19,899	37,878	42,715
Burke Hollow Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	166,469	83,555	275,014	417,792
Longhorn Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	10,157	3,265	25,533	6,072
Salvo Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	6,702	6,702	13,510	13,636
Anderson Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	15,056	14,572	37,270	30,030
Workman Creek Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	7,673	7,673	15,364	15,955
Slick Rock Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	12,206	14,192	29,430	27,805
Reno Creek Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	147,418	244,982	295,294	968,372
Yuty Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	62,600	134,228	86,003	225,196
Oviedo Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	40,758	19,046	61,483	81,242
Alto Parana Titanium Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	34,429	74,821	60,262	114,432
Other Property Acquisitions [Member]
Mineral Property Expenditures
Mineral Property Expenditures	$ 130,101	$ 120,065	$ 301,795	$ 237,138