Note 12 - Stock-based Compensation - Schedule of Outstanding Stock Options (Details) - $ / shares	3 Months Ended			6 Months Ended
	Jan. 31, 2024	Oct. 31, 2023	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Balance, number of stock options (in shares)	7,518,042	8,326,983		8,326,983
Balance, Weighted Average Exercise Price (in dollars per share)	$ 1.94	$ 1.92		$ 1.92
Granted (in shares)	10,000	17,500
Granted (in dollars per share)	$ 7.63	$ 5.04
Exercised (in shares)	(878,503)	(608,182)	(197,110)	(1,486,685)	(2,528,332)
Exercised (in dollars per share)	$ 1.45	$ 1.69
Cancelled/Forfeited, number of stock options (in shares)		(191,259)
Cancelled/Forfeited, Weighted Average Exercise Price (in dollars per share)		$ 1.59
Expired, number of stock options (in shares)		(27,000)
Expired (in dollars per share)		$ 3.69
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 7.63	$ 5.04
Exercised (in shares)	(878,503)	(608,182)	(197,110)	(1,486,685)	(2,528,332)
Exercised (in dollars per share)	$ 1.45	$ 1.69
Balance, October 31, 2023 (in shares)	6,649,539	7,518,042		6,649,539
Balance, October 31, 2023 (in dollars per share)	$ 2.01	$ 1.94		$ 2.01