Note 8 - Stock-based Compensation and Equity Transactions - Options Outstanding (Details)	6 Months Ended
	Apr. 30, 2023 $ / shares shares
Outstanding (in shares)	691,005
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 5.87
Options granted (in shares)	158,181
Options granted, weighted average exercise price (in dollars per share) | $ / shares	$ 5.46
Exercise of stock options (in shares)	45,000
Options exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 1.90
Options cancelled (in shares)	0
Options outstanding (in shares)	804,186
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 6.01
Options exercisable at April 30, 2023 (in shares)	471,466
Options exercisable at April 30, 2023 (in dollars per share) | $ / shares	$ 6.34
Options vested and expected to vest (in shares)	798,697
Options vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	$ 6.02