Note 5 - Mineral Rights and Properties (Details Textual)					12 Months Ended
	Aug. 07, 2019 USD ($) $ / shares shares	Mar. 14, 2019 $ / shares shares	May 01, 2018 USD ($) shares	Aug. 09, 2017 USD ($) shares	Jul. 31, 2019 USD ($) a $ / shares shares	Jul. 31, 2018 USD ($) $ / shares shares	Jul. 31, 2018 CAD ($) shares	Jul. 31, 2017 USD ($) $ / shares shares	Jul. 31, 2016 USD ($) $ / shares shares
Annual Property Maintenance Fees					$ 2,666,000
Consideration Shares, Fair Value, Net					9,022,055
Gain (Loss) on Disposition of Assets, Total					1,595,513	$ (1,696)		$ (1,055)
Exploration Abandonment and Impairment Expense								297,942
Revaluation Of Asset Retirement Obligations					274,195			$ 187,255
Mineral Properties, Gross					67,451,387	74,997,692
Mineral Properties, Accumulated Depletion					$ 3,929,884	$ 3,929,884
Class of Warrant or Right, Outstanding | shares					19,443,910	30,923,489		19,676,560	13,953,872
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 1.33			$ 1.94	$ 1.97		$ 1.78	$ 1.65
Royalty Profit Interest Rate				0.50%
Capped Royalty Amount				$ 2,500,000
Asset Acquisition Related Costs				779,509
Shares Issued During Period,Value For Asset Acquisition Transaction Cost				$ 283,013
Shares Issued During Period,Shares For Asset Acquisition Transaction Cost | shares				217,702
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		11,000,000
Aggregate Number of Shares for Common Stock | shares		750,000
Common Stock [Member]
Stock Issued During Period, Shares, Settlement Of Reimbursable Expenses | shares						353,160	353,160
Stock Issued During Period, Value, Settlement of Reimbursable Expenses						$ 483,829
Reno Creek Project [Member]
Area of Land | a					19,769
Mineral Properties, Gross					$ 31,527,870	$ 31,527,870
Approved Distribution Amount	$ 1,743,666
Payment To Acquire Assets	$ 909,930
Stock Issued During Period, Shares, Acquisitions | shares	14,392,927					14,634,748	14,634,748
Asset Acquisition Equity Interest Issued Or Issuable Additional Number Of Shares | shares	241,821
General Insurance Expense	$ 340,000
Stock Issued During Period, Value, Acquisitions						$ 20,332,617
Reno Creek Project [Member] | Common Stock [Member]
Stock Issued During Period, Shares, Acquisitions | shares						14,852,450	14,852,450
Stock Issued During Period, Value, Acquisitions						$ 14,853
Reno Creek Project [Member] | Warrant In Connection With Business Acquisition [Member]
Class of Warrant or Right, Outstanding | shares	11,308,728
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 2.30
Warrants and Rights Outstanding, Term	5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights Threshold | $ / shares	$ 4
Class of Warrants or Right, Period for Consecutive Trading	20 days
Uranerz Energy Corporation [Member]
Payment To Acquire Assets			$ 2,940,000
Asset Acquisition Related Costs			$ 416,958
Asset Acquisition Ownership Percentage			100.00%
Asset Acquisition Consideration Transferred			$ 5,974,063
Asset Acquisition Equity Interest Issued Or Issuable Number Of Shares | shares			1,625,531
Asset Acquisition Consideration Transferred Equity Interests Issued			$ 2,617,105
Minimum [Member]
Mineral Leases and Surface Use Agreements, Term				5 years
Maximum [Member]
Mineral Leases and Surface Use Agreements, Term				20 years
Palangana Mine [Member]
Area of Land | a					6,987
Mining Lease and Surface Use Agreements Realted to Royalty, Term					5 years
Increase (Decrease) in Corresponding Rights and Properties					$ (258,114)
Revaluation Of Asset Retirement Obligations					274,195	187,255
Depletion, Total					0	0		$ 0
Mineral Properties, Gross					6,027,784	6,285,898
Mineral Properties, Accumulated Depletion					3,929,884	3,929,884
Mineral Rights Net OfAccumulated Depletion					$ 2,097,900	$ 2,356,014
Goliad Project [Member]
Area of Land | a					995
Mineral Leases and Surface Use Agreements, Term					5 years
Burke Hollow Project [Member]
Area of Land | a					19,335
Mineral Leases and Surface Use Agreements, Term					5 years
Longhorn Project [Member]
Area of Land | a					651
Mineral Leases and Surface Use Agreements, Term					5 years
Salvo Project [Member]
Area of Land | a					1,514
Mineral Leases and Surface Use Agreements, Term					5 years
Anderson Project [Member]
Interest on Mineral Properties					100.00%
Diabase Project [Member]
Stock Issued During Period, Shares, Acquisitions | shares						164,767	164,767
Asset Acquisition Consideration Transferred						$ 546,938
Percentage Of Royalty Interests Acquired By Urc						100.00%
Cash Consideration Paid In Asset Acquisition						$ 239,120
Stock Issued During Period, Value, Acquisitions						232,321
Asset Acquisition Transaction Costs						75,497
Asset Acquisition Urc To Acquire Royalty Option							$ 125,000
Diabase Project [Member] | CANADA
Area of Land | a					56,106
Diabase Project [Member] | URC [Member]
Payments to Acquire Royalty Before Four Years After the Closing Date							$ 1,750,000
Yuty Project [Member]
Area of Land | a					289,680
Overriding Royalty Per Pound					0.21
Oviedo Project [Member]
Area of Land | a					223,749
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 | a					464,548
Royalties Percentage					1.50%
Percentage of Net Smelter Royalty, Right to Acquire					0.50%
Payments to Acquire Smelter Royalty					$ 500,000
Anderson Project [Member]
Increase (Decrease) in Carrying Value Due to Disposition of Asset					(5,683,895)
Consideration Shares, Fair Value, Net					$ 5,683,895
Area of Land | a					8,268
Mineral Properties, Gross					$ 3,470,373	9,154,268
Slick Rock Project [Member]
Increase (Decrease) In Carrying Amount Due To Allocation					(676,650)
Consideration Shares, Fair Value, Net					2,255,514
Gain (Loss) on Disposition of Assets, Total					$ 1,578,864
Area of Land | a					5,333
Mineral Properties, Gross						646,650
Interest on Mineral Properties					100.00%
Payments for Advance Royalties					$ 30,000	31,000
Slick Rock Project [Member] | Minimum [Member]
Net Smelter Royalty, Percent					1.00%
Slick Rock Project [Member] | Maximum [Member]
Net Smelter Royalty, Percent					3.00%
Workman Creek Project [Member]
Net Smelter Royalty, Percent					3.00%
Increase (Decrease) In Carrying Amount Due To Allocation					$ (1,082,646)
Consideration Shares, Fair Value, Net					$ 1,082,646
Area of Land | a					4,036
Mineral Properties, Gross					$ 699,854	1,657,500
Interest on Mineral Properties					100.00%
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					$ 125,000	$ 75,000
Stock Issued During Period, Shares, for Mineral Properties | shares						46,134	46,134	46,800
Stock Issued During Period, Value, for Mineral Properties						$ 61,820		$ 48,672
Los Cuatros Project [Member]
Area of Land | a					640
Mineral Properties, Gross					$ 257,250	257,250
Interest on Mineral Properties					100.00%
Reno Creek Project [Member]
Mineral Properties, Gross					$ 31,527,870	$ 31,527,870
Interest on Mineral Properties				100.00%
Reno Creek Project [Member] | PRRF [Membe]
Interest on Mineral Properties				97.27%
Reno Creek Project [Member] | Bayswater Holdings, Inc [Member]
Interest on Mineral Properties				2.73%
Royalty Purchase Agreement [Member] | Uranium Royalty Corp [Member]
Net Smelter Royalty, Percent					1.00%
Number Of Shares Acquired Through Sale Of Royalties | shares					12,000,000
Consideration Shares, Fair Value					$ 9,077,842
Consideration Shares, Transaction Cost					55,787
Consideration Shares, Fair Value, Net					$ 9,022,055