Note 8 - Equity-accounted Investment (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021	Jul. 31, 2021
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	$ (139,194)	$ 493,101	$ (613,935)	$ 1,041,900
Uranium Royalty Corp [Member]
Equity Method Investment, Shares Owned (in shares)	15,000,000		15,000,000
Equity Method Investment, Ownership Percentage	15.70%		15.70%		18.10%
Ownership Interest Percentage, Contingent, Outstanding Options and Warrants Fully Exercised	13.20%		13.20%
Equity Method Investments, Fair Value Disclosure	$ 50,600,000		$ 50,600,000
Gain on Dilution of Ownership Interest	1,158,239	413,881	3,730,421	413,881
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	$ (139,194)	$ 493,101	$ (613,935)	$ 1,041,900