Note 8 - Investments in Equity Securities - Changes in Investments in Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Balance			$ 38,656
Dispositions			(3,008)	$ 0
Additions to equity securities			12,115	42,219
Gain on revaluation of equity securities	$ (13,804)	$ (12,649)	23,585	$ (12,992)
Foreign exchange difference			(5)
Balance	$ 71,343		$ 71,343