Note 11 - Stock-based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares	6 Months Ended
	Jan. 31, 2026	Jul. 31, 2025
Options Outstanding (in shares)	3,551,087	4,594,207
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.78	$ 2.71
Options outstanding, weighted average remaining contractual term (Year)	5 years 10 months 17 days
Options exercisable (in shares)	3,326,996
Options exercisable, weighted average exercise price (in dollars per share)	$ 2.57
Options exercisable, weighted average remaining contractual term (Year)	5 years 8 months 12 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)	882,750
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.92
Options outstanding, weighted average remaining contractual term (Year)	4 years 3 months 14 days
Options exercisable (in shares)	882,750
Options exercisable, weighted average exercise price (in dollars per share)	$ 0.92
Options exercisable, weighted average remaining contractual term (Year)	4 years 3 months 14 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)	4 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)	4 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)	434,649
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.28
Options outstanding, weighted average remaining contractual term (Year)	5 years 4 months 28 days
Options exercisable (in shares)	434,649
Options exercisable, weighted average exercise price (in dollars per share)	$ 2.28
Options exercisable, weighted average remaining contractual term (Year)	5 years 4 months 28 days
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)	1,272,555
Options outstanding, weighted average exercise price (in dollars per share)	$ 3.62
Options outstanding, weighted average remaining contractual term (Year)	6 years 7 months 20 days
Options exercisable (in shares)	1,222,432
Options exercisable, weighted average exercise price (in dollars per share)	$ 3.61
Options exercisable, weighted average remaining contractual term (Year)	6 years 7 months 6 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)	14,000
Options outstanding, weighted average exercise price (in dollars per share)	$ 4.36
Options outstanding, weighted average remaining contractual term (Year)	8 years 8 months 23 days
Options exercisable (in shares)	6,500
Options exercisable, weighted average exercise price (in dollars per share)	$ 4.53
Options exercisable, weighted average remaining contractual term (Year)	8 years 2 months 15 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)	331,243
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.49
Options outstanding, weighted average remaining contractual term (Year)	8 years 5 months 23 days
Options exercisable (in shares)	236,763
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.49
Options exercisable, weighted average remaining contractual term (Year)	8 years 5 months 19 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)	8 years 3 months 29 days
Options exercisable (in shares)	42,316
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.56
Options exercisable, weighted average remaining contractual term (Year)	8 years 3 months 14 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)	7 years 11 months 23 days
Options exercisable (in shares)	10,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 7.63
Options exercisable, weighted average remaining contractual term (Year)	7 years 11 months 23 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)	66,332
Options outstanding, weighted average exercise price (in dollars per share)	$ 8.68
Options outstanding, weighted average remaining contractual term (Year)	9 years 5 months 26 days
Options exercisable (in shares)	16,586
Options exercisable, weighted average exercise price (in dollars per share)	$ 8.68
Options exercisable, weighted average remaining contractual term (Year)	9 years 5 months 26 days