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Note 3 - Mineral Rights and Properties (Details Textual)
12 Months Ended
Dec. 04, 2018
USD ($)
shares
Jul. 31, 2020
USD ($)
a
Jul. 31, 2019
USD ($)
a
shares
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Annual Property Maintenance Fees   $ 1,506,000        
Consideration Shares, Fair Value, Net     $ 9,022,055      
Gain (Loss) on Disposition of Assets, Total   2,343 1,595,513 $ (1,696)    
Revaluation Of Asset Retirement Obligations   274,195    
Mineral Properties, Gross   67,581,387 67,451,387      
Anderson Project [Member]            
Increase (Decrease) in Carrying Value Due to Disposition of Asset $ (5,683,895)   (5,683,895)      
Consideration Shares, Fair Value, Net     $ 5,683,895      
Area of Land (Acre) | a     8,268      
Interest on Mineral Properties     100.00%      
Mineral Properties, Gross   $ 3,470,373 $ 3,470,373 9,154,268    
Workman Creek Project [Member]            
Net Smelter Royalty, Percent   3.00%        
Increase (Decrease) In Carrying Amount Due To Allocation (1,082,646)   (1,082,646)      
Consideration Shares, Fair Value, Net     1,082,646      
Area of Land (Acre) | a   4,036        
Interest on Mineral Properties   100.00%        
Mineral Properties, Gross   $ 799,854 699,854      
Annual Advance Royalty Payment   $ 100,000     $ 50,000 $ 50,000
Right and Option to Acquire Net Smelter Royalty, Percent   1.50%        
Right and Option to Acquire Royalty, Amount   $ 1,000,000        
Additional Right and Option to Acquire Net Smelter Royalty Held by Certain Individuals, Percent   0.50%        
Amount of Royalty Interest Acquired   $ 333,340        
Payments for Advance Royalties   $ 100,000 125,000      
Slick Rock Project [Member]            
Increase (Decrease) In Carrying Amount Due To Allocation (676,650)          
Consideration Shares, Fair Value, Net $ 2,255,514   2,255,514      
Gain (Loss) on Disposition of Assets, Total     1,578,864      
Area of Land (Acre) | a   5,333        
Interest on Mineral Properties   100.00%        
Mineral Properties, Gross   $ 30,000      
Payments for Advance Royalties   $ 30,000 30,000      
Increase (Decrease) in Consideration of Interest     (676,650)      
Slick Rock Project [Member] | Minimum [Member]            
Net Smelter Royalty, Percent   1.00%        
Slick Rock Project [Member] | Maximum [Member]            
Net Smelter Royalty, Percent   3.00%        
Palangana Mine [Member]            
Area of Land (Acre) | a   6,987        
Mining Lease and Surface Use Agreements Realted to Royalty, Term (Year)   5 years        
Increase (Decrease) in Corresponding Rights and Properties     (258,114)      
Revaluation Of Asset Retirement Obligations     274,195      
Depletion, Total   $ 0 0 $ 0    
Mineral Properties, Gross   $ 6,027,784 6,027,784      
Goliad Project [Member]            
Area of Land (Acre) | a   995        
Mineral Leases and Surface Use Agreements, Term (Year)   5 years        
Mineral Properties, Gross   $ 8,689,127 8,689,127      
Burke Hollow Project [Member]            
Area of Land (Acre) | a   19,335        
Mineral Leases and Surface Use Agreements, Term (Year)   5 years        
Mineral Properties, Gross   $ 1,495,750 1,495,750      
Longhorn Project [Member]            
Area of Land (Acre) | a   651        
Mineral Leases and Surface Use Agreements, Term (Year)   5 years        
Mineral Properties, Gross   $ 116,870 116,870      
Salvo Project [Member]            
Area of Land (Acre) | a   1,340        
Mineral Leases and Surface Use Agreements, Term (Year)   5 years        
Mineral Properties, Gross   $ 14,905 14,905      
Los Cuatros Project [Member]            
Area of Land (Acre) | a   640        
Interest on Mineral Properties   100.00%        
Mineral Properties, Gross   $ 257,250 257,250      
Reno Creek Project [Member]            
Area of Land (Acre) | a   18,763        
Mineral Properties, Gross   $ 31,527,870 31,527,870      
Reno Creek Project [Member] | Minimum [Member]            
Mineral Leases and Surface Use Agreements, Term (Year)   5 years        
Reno Creek Project [Member] | Maximum [Member]            
Mineral Leases and Surface Use Agreements, Term (Year)   20 years        
Diabase Project [Member]            
Area of Land (Acre) | a   54,236        
Interest on Mineral Properties   100.00%        
Mineral Properties, Gross   $ 546,938 546,938      
Yuty Project [Member]            
Area of Land (Acre) | a   289,680        
Mineral Properties, Gross   $ 11,947,144 11,947,144      
Overriding Royalty Per Pound   0.21        
Oviedo Project [Member]            
Area of Land (Acre) | a   223,749        
Mineral Properties, Gross   $ 1,133,412 1,133,412      
Percentage of Gross Overriding Royalty   1.50%        
Percentage of Gross Overriding Royalty, Exclusive Right and Option   0.50%        
Overriding Royalty, Exclusive Right and Option to Acquire   $ 166,667        
Percentage of Gross Overriding Royalty, Remaining   1.00%        
Alto Parana Titanium Project [Member]            
Area of Land (Acre) | a   174,200        
Mineral Properties, Gross   $ 1,433,030 $ 1,433,030      
Royalties Percentage   1.50%        
Percentage of Net Smelter Royalty, Right to Acquire   0.50%        
Payments to Acquire Smelter Royalty   $ 500,000        
Royalty Purchase Agreement [Member] | Uranium Royalty Corp [Member]            
Net Smelter Royalty, Percent 1.00%          
Number Of Shares Acquired Through Sale Of Royalties (in shares) | shares 12,000,000   12,000,000      
Consideration Shares, Fair Value $ 9,077,842   $ 9,077,842      
Consideration Shares, Transaction Cost $ 55,787   55,787      
Consideration Shares, Fair Value, Net     $ 9,022,055