Note 9 - Equity-Accounted Investment (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Payments to Acquire Equity Method Investments	$ (0)	$ 3,397	$ (0)
Gain on Dilution of Ownership Interest	3,973	4,473	3,057
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	$ (679)	$ 613	$ (133)
Uranium Royalty Corp [Member]
Equity Method Investment, Shares Owned (in shares)	15,000,000
Equity Method Investment, Ownership Percentage	15.50%	18.10%
Ownership Interest Percentage, Contingent, Outstanding Options and Warrants Fully Exercised	13.00%
Equity Method Investments, Fair Value Disclosure	$ 43,700
Equity Method Investment, Additional Shares Acquired (in shares)		1,000,000
Equity Method Investment, Additional Shares Acquired, Price Per Share (in dollars per share)		$ 4.10
Payments to Acquire Equity Method Investments		$ 3,397