Note 7 - Equity-accounted Investments (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Apr. 30, 2024	Apr. 30, 2024	Apr. 30, 2023	Jul. 31, 2023
Payments to Acquire Equity Method Investments		$ 9,238,000	$ (0)
Equity Method Investments	$ 62,548,000	62,548,000		$ 48,110,000
Uranium Royalty Corp [Member]
Payments to Acquire Equity Method Investments		$ 9,238,000
Equity Method Investment, Shares Owned (in shares)	17,978,364	17,978,364
Equity Method Investment, Ownership Percentage	14.90%	14.90%		14.90%
Ownership Interest Percentage, Contingent, Outstanding Options and Warrants Fully Exercised	13.20%	13.20%
Equity Method Investments, Fair Value Disclosure	$ 41,200,000	$ 41,200,000		$ 34,200,000
Equity Method Investments	$ 38,700,000	$ 38,700,000		24,600,000
Uranium Royalty Corp [Member] | Common Stock, First Issuance [Member]
Equity Method Investment, Additional Shares Acquired (in shares)		1,930,750
Equity Method Investment, Additional Shares Acquired, Price Per Share (in dollars per share)		$ 2.94
Payments to Acquire Equity Method Investments		$ 5,676
Uranium Royalty Corp [Member] | Common Stock, Second Issuance [Member]
Equity Method Investment, Additional Shares Acquired (in shares)		1,047,614
Equity Method Investment, Additional Shares Acquired, Price Per Share (in dollars per share)		$ 3.4
Payments to Acquire Equity Method Investments		$ 3,562
JCU (Canada) Exploration Company Limited [Member]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
Equity Method Investment, Recoverable Exploration Expenditures	$ 11,000	$ 54,000
Equity Method Investment, Amount Owed from Acquisition Company	$ 3,000	$ 3,000		$ 201,000