Note 7 - Stock-based Compensation and Equity Transactions - Options Outstanding (Details) - $ / shares	6 Months Ended
	Apr. 30, 2021
Outstanding, shares (in shares)	789,179
Outstanding, weighted average exercise price (in dollars per share)	$ 4.66
Options granted, shares (in shares)	67,000
Options granted, weighted average exercise price (in dollars per share)	$ 4.98
Options exercised, shares (in shares)	(156,701)
Options exercised, weighted average exercise price (in dollars per share)	$ 3.10
Options cancelled, shares (in shares)	(91,793)
Options canceled or expired, weighted average exercise price (in dollars per share)	$ 5.88
Options outstanding, shares (in shares)	607,685
Options outstanding, weighted average exercise price (in dollars per share)	$ 4.91
Options exercisable, shares (in shares)	270,082
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.24
Options vested and expected to vest, shares (in shares)	607,349
Options vested and expected to vest, weighted average exercise price (in dollars per share)	$ 4.92