Note 7 - Stock-based Compensation and Equity Transactions - Options Outstanding (Details) - $ / shares	6 Months Ended
	Apr. 30, 2024	Nov. 01, 2023
Outstanding, shares (in shares)	754,186
Outstanding, weighted average exercise price (in dollars per share)	$ 5.19	$ 6.04
Options granted, shares (in shares)	245,001
Options granted, weighted average exercise price (in dollars per share)	$ 3.01
Exercise of stock options (in shares)	0
Options cancelled, shares (in shares)	36,015
Options cancelled (in dollars per share)	$ 8.07
Options outstanding, shares (in shares)	963,172
Options exercisable, shares (in shares)	516,776
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.94
Options vested and expected to vest, shares (in shares)	957,705
Options vested and expected to vest, weighted average exercise price (in dollars per share)	$ 5.09