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Note 9 - Investments in Equity Securities - Changes in Investments in Equity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2023
Jan. 31, 2022
Balance     $ 14,834  
Transferred as consideration for UEX Acquisition (Note 3)     (5,830)  
Additions to equity securities     26,328 $ 9,433
Loss on revaluation of equity securities $ 3,123 $ 0 (343) $ 547
Foreign exchange difference     (3)  
Balance $ 35,121   35,121  
UEX Acquisition [Member]        
Additions to equity securities     $ 135