Note 8 - Investments in Equity Securities - Changes in Investments in Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
Balance	$ 75,264
Sale of investment in publicly listed companies	(54,372)	$ (3,427)
Fair value loss on equity securities	(10,349)	$ 17,313
Foreign exchange difference	(2)
Balance	10,541
Investment in Public Listed Companies [Member]
Sale of investment in publicly listed companies	$ (54,372)