Note 7 - Stock-based Compensation and Equity Transactions - Options Outstanding (Details) - $ / shares	9 Months Ended
	Jul. 31, 2022
Outstanding at beginning of year (in shares)	618,858
Options outstanding at end of year, weighted average exercise price (in dollars per share)	$ 5.31
Options granted (in shares)	145,001
Options granted, weighted average exercise price (in dollars per share)	$ 6.94
Options exercised (in shares)	(60,854)
Options exercised, weighted average exercise price (in dollars per share)	$ 2.45
Options cancelled (in shares)	(12,000)
Options canceled or expired, weighted average exercise price (in dollars per share)	$ 7.58
Options outstanding at end of year (in shares)	691,005
Options outstanding at end of year, weighted average exercise price (in dollars per share)	$ 5.87
Options exercisable at end of year (in shares)	357,715
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.14
Options vested and expected to vest at end of year (in shares)	685,154
Options vested and expected to vest, weighted average exercise price (in dollars per share)	$ 5.88