Note 15 - Stock-Based Compensation Plans - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2020
Stock options outstanding (in shares)	206,234
Stock options outstanding (in dollars per share)	$ 51.67
Exercised (in shares)	(9,575)	0
Exercised (in dollars per share)	$ 51.50
Forfeited (in shares)	0
Forfeited (in dollars per share)	$ 0
Expired (in shares)	(30,100)
Expired (in dollars per share)	$ 71.97
Stock options outstanding (in shares)	166,559
Stock options outstanding (in dollars per share)	$ 48.02
Stock options exercisable at end of period (in shares)	127,780