Note 17 - Stock-based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Options Outstanding (in shares)	5,103,339	8,326,983	8,880,527	10,404,333
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.66	$ 1.92	$ 1.58	$ 1.21
Options outstanding, weighted average remaining contractual term (Year)	7 years 3 months 25 days
Options exercisable (in shares)	4,016,351
Options exercisable, weighted average exercise price (in dollars per share)	$ 2.2
Options exercisable, weighted average remaining contractual term (Year)	6 years 9 months 25 days
Exercise Price Range 1 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 0.91
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 0.99
Options Outstanding (in shares)	1,440,500
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.92
Options outstanding, weighted average remaining contractual term (Year)	5 years 9 months 3 days
Options exercisable (in shares)	1,440,500
Options exercisable, weighted average exercise price (in dollars per share)	$ 0.92
Options exercisable, weighted average remaining contractual term (Year)	5 years 9 months 3 days
Exercise Price Range 2 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 1
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 1.99
Options Outstanding (in shares)	475,000
Options outstanding, weighted average exercise price (in dollars per share)	$ 1.1
Options outstanding, weighted average remaining contractual term (Year)	5 years 11 months 15 days
Options exercisable (in shares)	475,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 1.1
Options exercisable, weighted average remaining contractual term (Year)	5 years 11 months 15 days
Exercise Price Range 3 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 2
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 2.99
Options Outstanding (in shares)	537,149
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.26
Options outstanding, weighted average remaining contractual term (Year)	6 years 11 months 1 day
Options exercisable (in shares)	537,149
Options exercisable, weighted average exercise price (in dollars per share)	$ 2.26
Options exercisable, weighted average remaining contractual term (Year)	6 years 11 months 1 day
Exercise Price Range 4 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 3
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 3.99
Options Outstanding (in shares)	2,164,729
Options outstanding, weighted average exercise price (in dollars per share)	$ 3.61
Options outstanding, weighted average remaining contractual term (Year)	8 years 2 months 4 days
Options exercisable (in shares)	1,550,559
Options exercisable, weighted average exercise price (in dollars per share)	$ 3.68
Options exercisable, weighted average remaining contractual term (Year)	8 years 10 days
Exercise Price Range 5 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 4
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 4.99
Options Outstanding (in shares)	7,500
Options outstanding, weighted average exercise price (in dollars per share)	$ 4.56
Options outstanding, weighted average remaining contractual term (Year)	8 years 9 months 21 days
Options exercisable (in shares)	2,500
Options exercisable, weighted average exercise price (in dollars per share)	$ 4.48
Options exercisable, weighted average remaining contractual term (Year)	8 years 8 months 1 day
Exercise Price Range 6 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 5
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 5.99
Options Outstanding (in shares)	428,318
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.48
Options outstanding, weighted average remaining contractual term (Year)	9 years 11 months 15 days
Options exercisable (in shares)	3,125
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.16
Options exercisable, weighted average remaining contractual term (Year)	9 years 1 month 28 days
Exercise Price Range 7 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 6
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 6.99
Options Outstanding (in shares)	40,143
Options outstanding, weighted average exercise price (in dollars per share)	$ 6.7
Options outstanding, weighted average remaining contractual term (Year)	9 years 7 months 17 days
Options exercisable (in shares)	5,018
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.7
Options exercisable, weighted average remaining contractual term (Year)	9 years 7 months 17 days
Exercise Price Range 8 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 7
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 7.63
Options Outstanding (in shares)	10,000
Options outstanding, weighted average exercise price (in dollars per share)	$ 7.63
Options outstanding, weighted average remaining contractual term (Year)	9 years 5 months 23 days
Options exercisable (in shares)	2,500
Options exercisable, weighted average exercise price (in dollars per share)	$ 7.63
Options exercisable, weighted average remaining contractual term (Year)	9 years 5 months 23 days