Equity incentive plan (Details) - USD ($)					12 Months Ended
	Mar. 04, 2019	Apr. 05, 2018	Apr. 04, 2007	Sep. 10, 1998	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
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
Vesting term	5 years
No. of Options Outstanding
Options outstanding beginning of year					310,740	310,740	305,780
Options granted during year	5,000						5,000
Options forfeited/cancelled during year							(40)
Options outstanding end of year					310,740	310,740	310,740
Options vested and expected to vest					309,450	308,310	308,310
Options exercisable at end of year					292,540	276,340	260,140
Exercise Price
Options outstanding beginning of year					$ 18.35	$ 18.35	$ 18.40
Options granted during year	$ 15.00						15.00
Options forfeited/cancelled during year							18.45
Options outstanding end of year					$ 18.35	$ 18.35	18.35
Estimated fair value of options granted							$ 2.43
Such value was estimated on the grant date using a binomial lattice option pricing model using the following assumptions:
Expected volatility							27.69%
Risk-free interest rate							2.72%
Imputed option life							6 years 3 months 18 days
Expected dividend yield							3.82%
Compensation expense related to stock options					$ 42,000	$ 46,000	$ 124,000
Unrecognized compensation cost					$ 30,000
Unrecognized compensation cost, recognition period					1 year 7 months 6 days
Aggregate intrinsic value of options expected to vest					$ 410,000
Aggregate intrinsic value of options exercisable					$ 341,000