Note 9 - Stock Options - Options Outstanding (Details) - USD ($)	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Outstanding at beginning of year (in shares)	618,858	789,179
Outstanding at beginning of year, weighted average exercise price (in dollars per share)	$ 5.33	$ 4.66
Options granted (in shares)	145,001	117,000
Options granted, weighted average exercise price (in dollars per share)	$ 6.94	$ 6.57
Options exercised (in shares)	(60,854)	(195,528)
Options exercised, weighted average exercise price (in dollars per share)	$ 2.45	$ 3.10
Options canceled or expired (in shares)	(12,000)	(91,793)
Options canceled or expired, weighted average exercise price (in dollars per share)	$ 7.58	$ 5.88
Options outstanding at end of year (in shares)	691,005	618,858
Options outstanding at end of year, weighted average exercise price (in dollars per share)	$ 5.87	$ 5.33
Options exercisable at end of year (in shares)	366,714	313,381
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.13	$ 5.95
Options vested and expected to vest at end of year (in shares)	685,154	618,522
Options vested and expected to vest, weighted average exercise price (in dollars per share)	$ 5.88	$ 5.35
Aggregate intrinsic value of options exercised during year	$ 245,420	$ 642,181
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)	$ 1.90	$ 1.90
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)	$ 8.69	$ 8.69