Note 12 - Derivative Liabilities - Movement in Derivative Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2023	Jul. 31, 2022
Balance	$ 0
Fair value of derivative liabilities assumed from UEX Acquisition (Note 3)	8,903
Warrants exercised	(188)
Change in fair value during the period	(4,463)
Balance	4,252
Derivative liabilities, current	1,034	$ 0
Derivative liabilities, non-current	$ 3,218	$ 0