Note 13 - Stock-based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares	6 Months Ended
	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024
Options Outstanding (in shares)	4,857,230	4,942,317	5,103,339
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.66	$ 2.67	$ 2.66
Options outstanding, weighted average remaining contractual term (Year)	6 years 9 months 18 days
Options exercisable (in shares)	4,146,433
Options exercisable, weighted average exercise price (in dollars per share)	$ 2.32
Options exercisable, weighted average remaining contractual term (Year)	6 years 5 months 15 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)	1,392,750
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.92
Options outstanding, weighted average remaining contractual term (Year)	5 years 3 months 3 days
Options exercisable (in shares)	1,392,750
Options exercisable, weighted average exercise price (in dollars per share)	$ 0.92
Options exercisable, weighted average remaining contractual term (Year)	5 years 3 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 5 months 12 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 5 months 12 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 5 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 5 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)	1,976,654
Options outstanding, weighted average exercise price (in dollars per share)	$ 3.61
Options outstanding, weighted average remaining contractual term (Year)	7 years 7 months 24 days
Options exercisable (in shares)	1,630,427
Options exercisable, weighted average exercise price (in dollars per share)	$ 3.64
Options exercisable, weighted average remaining contractual term (Year)	7 years 6 months 21 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 5 months 1 day
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 3 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)	408,580
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.48
Options outstanding, weighted average remaining contractual term (Year)	9 years 5 months 15 days
Options exercisable (in shares)	104,268
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.47
Options exercisable, weighted average remaining contractual term (Year)	9 years 5 months 4 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 3 months 29 days
Options exercisable (in shares)	13,089
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.58
Options exercisable, weighted average remaining contractual term (Year)	9 years 3 months 3 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)	$ 7.99
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)	8 years 11 months 19 days
Options exercisable (in shares)	5,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 7.63
Options exercisable, weighted average remaining contractual term (Year)	8 years 11 months 19 days
Exercise Price Range 9 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 8
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 8.28
Options Outstanding (in shares)	1,289
Options outstanding, weighted average exercise price (in dollars per share)	$ 8.28
Options outstanding, weighted average remaining contractual term (Year)	9 years 9 months 18 days
Options exercisable (in shares)	0
Options exercisable, weighted average exercise price (in dollars per share)	$ 8.28
Options exercisable, weighted average remaining contractual term (Year)	9 years 9 months 18 days