Note 9 - Stock Options - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022
Outstanding at beginning of year (in shares)	691,005	618,858
Outstanding at beginning of year (in dollars per share)	$ 5.87	$ 5.33
Options granted (in shares)	168,181	145,001
Options granted, weighted average exercise price (in dollars per share)	$ 5.36	$ 6.94
Options exercised (in shares)	(45,000)	(60,854)
Options exercised, weighted average exercise price (in dollars per share)	$ 1.9	$ 2.45
Options canceled or expired (in shares)	(60,000)	(12,000)
Options canceled or expired, weighted average exercise price (in dollars per share)	$ 5.33	$ 7.58
Options outstanding at end of year (in shares)	754,186	691,005
Options outstanding at end of year (in dollars per share)	$ 6.04	$ 5.87
Options exercisable at end of year (in shares)	479,588	366,714
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.1	$ 6.13
Options vested and expected to vest at end of year (in shares)	748,358	685,154
Options vested and expected to vest, weighted average exercise price (in dollars per share)	$ 6.13	$ 5.88
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)	1.9	1.9
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)	$ 8.69	$ 8.69
Aggregate intrinsic value of options exercised during year	$ 144,005	$ 245,420