Equity incentive plan (Schedule of Stock Option Activity) (Details) - Employee Stock Option [Member] - $ / shares	6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
No. of Options Outstanding
Options outstanding at beginning of period	310,740	310,740
Options granted during period
Options forfeited/cancelled during period
Options outstanding at end of period	310,740	310,740
Options vested and expected to vest	309,450	308,310
Options exercisable at end of period	293,540	277,340
Weighted Average Price
Options outstanding beginning of period	$ 18.35	$ 18.35
Options granted during period
Options forfeited/cancelled during period
Options outstanding end of period	$ 18.35	$ 18.35