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, 2019	Oct. 31, 2018	Oct. 31, 2017
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 period								305,780
Options granted during period	5,000	38,000		38,000	246,000			5,000
Options forfeited/cancelled during period								(40)
Options outstanding end of period								310,740	305,780
Options vested and expected to vest								308,310
Options exercisable at end of period								260,140
Exercise Price
Options outstanding beginning of period								$ 18.40
Options granted during period	$ 15.00	$ 15.50		$ 21.00	$ 18.45			15.00
Options forfeited/cancelled during period								18.45
Options outstanding end of period								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 19 days	6 years 7 months 6 days
Expected dividend yield								3.82%	4.70%
Compensation expense related to stock options								$ 124,000	$ 130,000	$ 122,000
Unrecognized compensation cost								$ 117,000
Unrecognized compensation cost, recognition period								3 years 1 month 6 days
Aggregate intrinsic value of options expected to vest								$ 77,100
Aggregate intrinsic value of options exercisable								$ 13,600