Note 8 - Stock Options - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
Outstanding at beginning of year (in shares)	754,186	691,005
Outstanding at beginning of year (in dollars per share)	$ 6.04	$ 5.87
Options granted (in shares)	245,001	168,181
Options granted, weighted average exercise price (in dollars per share)	$ 3.01	$ 5.36
Options exercised (in shares)	0	(45,000)
Options exercised, weighted average exercise price (in dollars per share)	$ 0	$ 1.9
Options canceled or expired (in shares)	(124,371)	(60,000)
Options canceled or expired, weighted average exercise price (in dollars per share)	$ 6.42	$ 5.33
Options outstanding at end of year (in shares)	874,816	754,186
Options outstanding at end of year (in dollars per share)	$ 5.1	$ 6.04
Options exercisable at end of year (in shares)	478,986	479,588
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.95	$ 6.1
Options vested and expected to vest at end of year (in shares)	874,816	748,358
Options vested and expected to vest, weighted average exercise price (in dollars per share)	$ 5.1	$ 6.13
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	$ 0	$ 144,005