Note 19 - Fair Value Gain (Loss) on Equity Securities - Unrealized Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Unrealized and realized gain (loss) from common shares and warrants of publicly listed companies	$ 27,505	$ (13,083)	$ (1,351)
Other Public Listed Companies [Member]
Unrealized and realized gain (loss) from common shares and warrants of publicly listed companies	27,505	(11,999)	(1,351)
Uex Shares Transferred As Consideration for Uex Acquisition [Member]
Unrealized and realized gain (loss) from common shares and warrants of publicly listed companies	$ 0	$ (1,084)	$ 0