Equity incentive plan (Details) - USD ($)								12 Months Ended
	Mar. 04, 2019	May 03, 2018	Apr. 05, 2018	Nov. 10, 2016	Sep. 04, 2014	Apr. 04, 2007	Sep. 10, 1998	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be issued under plan							920,000
Increase in number of shares authorized			300,000			300,000	920,000
Shares available for issuance								442,060
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan term	10 years	10 years		10 years	10 years
Vesting term	5 years	5 years		5 years
No. of Options Outstanding
Options outstanding beginning of year								310,740	305,780	267,780
Options granted during year	5,000	38,000		38,000	246,000				5,000	38,000
Options forfeited/cancelled during year									(40)
Options outstanding end of year								310,740	310,740	305,780
Options vested and expected to vest								308,310	308,310	299,140
Options exercisable at end of year								276,340	260,140	200,260
Exercise Price
Options outstanding beginning of year								$ 18.35	$ 18.40	$ 18.81
Options granted during year	$ 15.00	$ 15.50		$ 21.00	$ 18.45				15.00	15.50
Options forfeited/cancelled during year									18.45
Options outstanding end of year								$ 18.35	18.35	18.40
Estimated fair value of options granted									$ 2.43	$ 2.09
Such value was estimated on the grant date using a binomial lattice option pricing model using the following assumptions:
Expected volatility									27.69%	27.60%
Risk-free interest rate									2.72%	2.94%
Imputed option life									6 years 3 months 18 days	6 years 7 months 6 days
Expected dividend yield									3.82%	4.70%
Compensation expense related to stock options								$ 46,000	$ 124,000	$ 130,000
Unrecognized compensation cost								$ 71,000
Unrecognized compensation cost, recognition period								2 years 3 months 18 days