Note 6 - Mineral Rights and Properties - Mineral Rights and Property Acquisition Costs (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Jul. 31, 2021
Mineral Properties, Gross	$ 185,877	$ 67,711
Accumulated Depletion	(3,930)	(3,930)
Mineral Properties Excluding Mineral Rights, Net	181,947	63,781
Mineral Properties, Net, Total	181,948	63,784
Palangana Mine [Member]
Mineral Properties, Gross	6,028	6,028
Goliad Project [Member]
Mineral Properties, Gross	8,689	8,689
Burke Hollow Project [Member]
Mineral Properties, Gross	1,496	1,496
Anderson Project [Member]
Mineral Properties, Gross	3,470	3,470
Workman Creek Project [Member]
Mineral Properties, Gross	1,000	900
Reno Creek Project [Member]
Mineral Properties, Gross	31,528	31,528
Christensen Ranch Mine [Member]
Mineral Properties, Gross	39,062	0
Ludeman Project [Member]
Mineral Properties, Gross	32,306	0
Antelope Project [Member]
Mineral Properties, Gross	29,855	0
Moore Ranch Project [Member]
Mineral Properties, Gross	4,972	0
Irigaray Project [Member]
Mineral Properties, Gross	1,362	0
Barge Project [Member]
Mineral Properties, Gross	3,136	0
Gas Hills Project [Member]
Mineral Properties, Gross	980	0
Nine Mile Project [Member]
Mineral Properties, Gross	954	0
Charlie Project [Member]
Mineral Properties, Gross	905	0
Diabase Project [Member]
Mineral Properties, Gross	982	547
Yuty Project [Member]
Mineral Properties, Gross	11,947	11,947
Oviedo Project [Member]
Mineral Properties, Gross	1,133	1,133
Alto Parana Titanium Project [Member]
Mineral Properties, Gross	1,933	1,433
Other Property Acquisitions [Member]
Mineral Properties, Gross	4,139	540
Databases and Land Use Agreements [Member]
Databases and Land Use Agreements	2,459	2,459
Accumulated Amortization	(2,458)	(2,456)
Mineral Rights	1	3
Mineral Rights and Properties [Member]
Mineral Properties, Net, Total	$ 181,948	$ 63,784