Note 4 - Mineral Rights and Properties - Mineral Property Expenditures (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Mineral Property Expenditures
Mineral Property Expenditures	$ 1,453,358	$ 981,493	$ 3,218,818	$ 3,638,408
Palangana Mine [Member]
Mineral Property Expenditures
Mineral Property Expenditures	248,687	264,447	775,311	740,977
Goliad Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	34,071	28,658	71,949	71,373
Burke Hollow Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	605,025	152,307	880,039	570,099
Longhorn Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	10,157	5,760	35,691	11,832
Salvo Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	6,702	6,702	20,211	20,338
Anderson Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	15,097	15,211	52,367	45,241
Workman Creek Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	7,673	7,673	23,037	23,627
Slick Rock Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	12,206	12,206	41,637	40,012
Reno Creek Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	178,722	158,546	474,015	1,126,918
Yuty Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	8,297	114,481	94,299	339,677
Oviedo Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	105,724	17,982	167,207	99,224
Alto Parana Titanium Project [Member]
Mineral Property Expenditures
Mineral Property Expenditures	78,325	33,312	138,588	147,744
Other Property Acquisitions [Member]
Mineral Property Expenditures
Mineral Property Expenditures	$ 142,672	$ 164,208	$ 444,467	$ 401,346