Note 4 - Mineral Rights and Properties (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Annual Property Maintenance Fees	$ 2,516,000		$ 2,516,000
Consideration Shares, Fair Value, Net			9,022,055
Gain (Loss) on Disposition of Assets, Total	7,598	$ (1,222)	1,591,362	$ (1,696)
Common Stock [Member]
Stock Issued During Period, Shares, Settlement Of Reimbursable Expenses				353,160
Stock Issued During Period, Value, Settlement of Reimbursable Expenses				$ 483,829
Palangana Mine [Member]
Depletion, Total	$ 0	$ 0	0	$ 0
Anderson Project [Member]
Increase (Decrease) in Carrying Value Due to Disposition of Asset			(5,683,895)
Consideration Shares, Fair Value, Net			5,683,895
Workman Creek Project [Member]
Increase (Decrease) In Carrying Amount Due To Allocation			(1,082,646)
Consideration Shares, Fair Value, Net			1,082,646
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
Royalty Purchase Agreement [Member] | Uranium Royalty Corp [Member]
Royalties Percentage			1.00%
Number Of Shares Acquired Through Sale Of Royalties			12,000,000
Consideration Shares, Fair Value			$ 9,077,842
Consideration Shares, Transaction Cost			55,787
Consideration Shares, Fair Value, Net			$ 9,022,055