Note 12 - Investments in Equity Securities - Changes in Investments in Equity Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Balance, beginning of year	$ 38,656	$ 14,834
Acquired from UEX Acquisition (Note 3)	12,115	47,192	$ 15,215
Sale of investment in public listed companies	(3,008)	(4,590)	(9,980)
Fair value gain (loss) on equity securities (Note 19)	27,505	(13,083)
Foreign exchange difference	(4)	(2)
Balance	75,264	38,656	$ 14,834
Current investment in equity securities	(68,731)	0
Non-current investment in equity securities	6,533	38,656
Investment in Public Listed Companies [Member]
Acquired from UEX Acquisition (Note 3)	12,115	47,192
Sale of investment in public listed companies	(3,008)	(4,590)
UEX Acquisition [Member]
Transferred as consideration for UEX Acquisition (Note 3)	0	(5,830)
Acquired from UEX Acquisition (Note 3)	$ 0	$ 135