Note 12 - Stock-based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares	3 Months Ended
	Oct. 31, 2024	Jul. 31, 2024
Options Outstanding (in shares)	4,942,317	5,103,339
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.67	$ 2.66
Options outstanding, weighted average remaining contractual term (Year)	7 years 25 days
Options exercisable (in shares)	3,930,301
Options exercisable, weighted average exercise price (in dollars per share)	$ 2.23
Options exercisable, weighted average remaining contractual term (Year)	6 years 6 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)	1,400,750
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.92
Options outstanding, weighted average remaining contractual term (Year)	5 years 6 months 3 days
Options exercisable (in shares)	1,400,750
Options exercisable, weighted average exercise price (in dollars per share)	$ 0.92
Options exercisable, weighted average remaining contractual term (Year)	5 years 6 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 8 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 8 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)	522,149
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.26
Options outstanding, weighted average remaining contractual term (Year)	6 years 8 months 1 day
Options exercisable (in shares)	522,149
Options exercisable, weighted average exercise price (in dollars per share)	$ 2.26
Options exercisable, weighted average remaining contractual term (Year)	6 years 8 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)	2,041,229
Options outstanding, weighted average exercise price (in dollars per share)	$ 3.61
Options outstanding, weighted average remaining contractual term (Year)	7 years 10 months 28 days
Options exercisable (in shares)	1,458,559
Options exercisable, weighted average exercise price (in dollars per share)	$ 3.68
Options exercisable, weighted average remaining contractual term (Year)	7 years 8 months 4 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)	6,250
Options outstanding, weighted average exercise price (in dollars per share)	$ 4.62
Options outstanding, weighted average remaining contractual term (Year)	8 years 8 months 4 days
Options exercisable (in shares)	3,750
Options exercisable, weighted average exercise price (in dollars per share)	$ 4.56
Options exercisable, weighted average remaining contractual term (Year)	8 years 6 months 21 days
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)	422,381
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.48
Options outstanding, weighted average remaining contractual term (Year)	9 years 8 months 15 days
Options exercisable (in shares)	57,556
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.45
Options exercisable, weighted average remaining contractual term (Year)	9 years 7 months 20 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)	64,558
Options outstanding, weighted average exercise price (in dollars per share)	$ 6.51
Options outstanding, weighted average remaining contractual term (Year)	9 years 6 months 29 days
Options exercisable (in shares)	10,037
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.7
Options exercisable, weighted average remaining contractual term (Year)	9 years 4 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 2 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 2 months 23 days