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Note 7 - Equity-accounted Investments (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 01, 2024
Jan. 31, 2024
Jan. 31, 2024
Jan. 31, 2023
Jul. 31, 2023
Payments to Acquire Equity Method Investments     $ 5,676 $ (0)  
Equity Method Investments   $ 56,453 $ 56,453   $ 48,110
Uranium Royalty Corp [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    
Equity Method Investment, Shares Owned (in shares)   16,930,750 16,930,750    
Equity Method Investment, Ownership Percentage   15.00% 15.00%   14.90%
Ownership Interest Percentage, Contingent, Outstanding Options and Warrants Fully Exercised   13.00% 13.00%    
Equity Method Investments, Fair Value Disclosure   $ 57,200 $ 57,200   $ 34,200
Equity Method Investments   $ 32,300 $ 32,300   24,600
Uranium Royalty Corp [Member] | Subsequent Event [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 $ 3,600        
JCU (Canada) Exploration Company Limited [Member]          
Equity Method Investment, Ownership Percentage   50.00% 50.00%    
Equity Method Investment, Recoverable Exploration Expenditures   $ 12 $ 43    
Equity Method Investment, Amount Owed from Acquisition Company   $ 8 $ 8   $ 201