Note 17 - Stock-based Compensation - Schedule of Outstanding Unvested Stock Options (Details) - $ / shares	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Nonvested balance (in shares)	2,186,154	3,891,207	6,797,471
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 1.79	$ 0.66	$ 0.46
Granted, number of stock options (in shares)	1,205,254	1,279,692	959,588
Granted, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.18	$ 2.45	$ 1.30
Vested, number of unvested stock options (in shares)	(3,865,242)	(2,984,745)	(3,865,852)
Vested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 1.66	$ 0.59	$ 0.47
Issuance of Replacement Options (Note 3), number of unvested stock options (in shares)	2,301,750
Issuance of Replacement Options (Note 3), Weighted Average Exercise Price (in dollars per share)	$ 1.75
Forfeited, number of unvested stock options (in shares)	(24,651)
Forfeited, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.00
Nonvested balance (in shares)	1,803,265	2,186,154	3,891,207
Nonvested, Weighted Average Grant-Date Fair Value (in dollars per share)	$ 2.28	$ 1.79	$ 0.66