Note 19 - Fair Value Loss on Equity Securities - Unrealized loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Gain (loss) from investment	$ (13,083)	$ (1,351)	$ 0
Anfield Common Shares [Member]
Gain (loss) from investment	(2,214)	(1,925)	0
Anfield Warrant [Member]
Gain (loss) from investment	(1,048)	(1,105)	0
UEX Shares [Member]
Gain (loss) from investment	0	1,132	0
Other Public Listed Companies [Member]
Gain (loss) from investment	(8,737)	547	0
Uex Shares Transferred As Consideration for Uex Acquisition [Member]
Gain (loss) from investment	$ (1,084)	$ 0	$ 0