Note 7 - Equity-accounted Investment (Details Textual) - Uranium Royalty Corp [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Jul. 31, 2020
Equity Method Investment, Shares Owned (in shares)	14,000,000		14,000,000
Equity Method Investment, Ownership Percentage	19.50%		19.50%		19.50%
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	$ 486,038	$ (39,648)	$ 548,799	$ (49,542)
Equity Method Investments, Fair Value Disclosure	$ 21,900,000		$ 21,900,000