Note 8 - Equity-accounted Investment (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Jul. 31, 2021
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	$ (617,910)	$ 486,038	$ (474,741)	$ 548,799
Uranium Royalty Corp [Member]
Equity Method Investment, Shares Owned (in shares)	15,000,000		15,000,000
Equity Method Investment, Ownership Percentage	16.20%		16.20%		18.10%
Ownership Interest Percentage, Contingent, Outstanding Options and Warrants Fully Exercised	13.50%		13.50%
Equity Method Investments, Fair Value Disclosure	$ 48,800,000		$ 48,800,000
Gain on Dilution of Ownership Interest	653,728		2,572,182
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	$ (617,910)	$ 486,038	$ (474,741)	$ 548,799