Note 7 - Equity-accounted Investment (Details Textual)	12 Months Ended
	Jul. 31, 2021 USD ($) $ / shares shares	Jul. 31, 2021 USD ($) shares	Jul. 31, 2020 USD ($)
Payments to Acquire Equity Method Investments		$ 3,396,852
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total		$ 613,491	$ (132,705)
Uranium Royalty Corp [Member]
Ownership Interest Percentage, Contingent, Outstanding Options and Warrants Fully Exercised	13.90%	13.90%
Uranium Royalty Corp [Member]
Equity Method Investment, Additional Shares Acquired (in shares) | shares		1,000,000
Equity Method Investment, Additional Shares Acquired, Price Per Share (in CAD per share) | $ / shares	$ 4.10
Payments to Acquire Equity Method Investments		$ 3,396,852
Equity Method Investment, Shares Owned (in shares) | shares	15,000,000	15,000,000
Equity Method Investments, Fair Value Disclosure	$ 43,900,000	$ 43,900,000
Equity Method Investment, Ownership Percentage	18.10%	18.10%	19.50%
Gain on ownership interest dilution		$ 4,471,558	$ 3,056,656
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total		$ 613,491	$ (132,705)