Note 17 - Stock-based Compensation - Summary of Stock Options Assumptions (Details) - $ / shares	12 Months Ended
	Jul. 31, 2023		Jul. 31, 2022	Jul. 31, 2021
Granted, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.18		$ 2.45	$ 1.30
Share-Based Payment Arrangement, Option [Member]
Expected Risk Free Interest Rate	4.14%	[1]	2.73%	0.70%
Expected Volatility	79.43%	[1]	78.75%	72.57%
Expected Life in Years (Year)	4 years 10 months 24 days	[1]	4 years 11 months 15 days	5 years
Expected Dividend Yield	0.00%	[1]	0.00%	0.00%
Granted, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.18	[1]	$ 2.45	$ 1.30

[1] The assumptions used for the fair value measurement of the Replacement Options are excluded in the table below as they have been separately disclosed in Note 3.