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Note 6 - Mineral Rights and Properties (Details Textual)
$ in Thousands
12 Months Ended
Jul. 31, 2022
USD ($)
shares
Jul. 31, 2021
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2016
USD ($)
Annual Property Maintenance Fees $ 4,200      
Stock Issued During Period, Value, for Mineral Properties 426      
Payments to Acquire Mineral Rights 590 $ 80 $ 80  
Mineral Properties, Gross $ 185,877 67,711    
Palangana Mine [Member]        
Mining Lease and Surface Use Agreements Realted to Royalty, Term (Year) 5 years      
Depletion, Total $ 0 0    
Mineral Properties, Gross $ 6,028 6,028    
Goliad Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 5 years      
Mineral Properties, Gross $ 8,689 8,689    
Burke Hollow Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 5 years      
Mineral Properties, Gross $ 1,496 1,496    
Anderson Project [Member]        
Interest on Mineral Properties 100.00%      
Mineral Properties, Gross $ 3,470 3,470    
Workman Creek Project [Member]        
Interest on Mineral Properties 100.00%      
Net Smelter Royalty, Percent 3.00%      
Annual Advance Royalty Payment $ 100     $ 50
Right and Option to Acquire Net Smelter Royalty, Percent 1.50%      
Right and Option to Acquire Royalty, Amount $ 1,000      
Additional Right and Option to Acquire Net Smelter Royalty Held by Certain Individuals, Percent 0.50%      
Amount of Royalty Interest Acquired $ 333      
Mineral Properties, Gross $ 1,000 900    
Christensen Ranch Mine [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 10 years      
Mineral Properties, Gross $ 39,062 0    
Irigaray Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 10 years      
Mineral Properties, Gross $ 1,362 0    
Ludeman Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 10 years      
Mineral Properties, Gross $ 32,306 0    
Moore Ranch Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 10 years      
Mineral Properties, Gross $ 4,972 0    
Antelope Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 10 years      
Mineral Properties, Gross $ 29,855 0    
Gas Hills Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 10 years      
Mineral Properties, Gross $ 980 0    
Nine Mile Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 10 years      
Mineral Properties, Gross $ 954 0    
Charlie Project [Member]        
Mineral Leases and Surface Use Agreements, Term (Year) 10 years      
Mineral Properties, Gross $ 905 0    
Charlie Project [Member] | Minimum [Member]        
Mineral Leases and Surface Use Royalty Interest, Term (Year) 5 years      
Charlie Project [Member] | Maximum [Member]        
Mineral Leases and Surface Use Royalty Interest, Term (Year) 20 years      
Diabase Project Addition [Member]        
Number of Mineral Claims 10      
Net Consideration, Mineral Resources $ 435      
Stock Issued During Period, Shares, for Mineral Properties (in shares) | shares 111,864      
Stock Issued During Period, Value, for Mineral Properties $ 426      
Payments to Acquire Mineral Rights 9      
Diabase Project [Member]        
Mineral Properties, Gross 982 547    
Yuty Project [Member]        
Mineral Properties, Gross $ 11,947 11,947    
Overriding Royalty Per Pound 0.21      
Oviedo Project [Member]        
Mineral Properties, Gross $ 1,133 1,133    
Percentage of Gross Overriding Royalty 1.50%      
Percentage of Net Smelter Royalty, Right to Acquire 0.50%      
Overriding Royalty, Exclusive Right and Option to Acquire $ 167      
Percentage of Gross Overriding Royalty, Remaining 1.00%      
Alto Parana Titanium Project [Member]        
Amount of Royalty Interest Acquired $ 500      
Mineral Properties, Gross $ 1,933 $ 1,433    
Percentage of Gross Overriding Royalty 1.50%      
Percentage of Net Smelter Royalty, Right to Acquire 0.50%      
Overriding Royalty, Exclusive Right and Option to Acquire $ 500      
Percentage of Royalty Interest Acquired 0.50%