Stock option plan (Details) - Employee Stock Option [Member] - USD ($)		3 Months Ended	9 Months Ended
	Sep. 04, 2014	Jul. 31, 2015	Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan term	10 years
Vesting term	5 years
Vesting rate	20.00%
No. of Options Outstanding
Options outstanding beginning of period			246,000
Options granted during period	246,000
Options forfeited/cancelled during the period			(2,100)
Options outstanding end of period		243,900	243,900
Options expected to vest		238,620	238,620
Options exercisable at end of period
Exercise Price
Options outstanding beginning of period			$ 18.45
Options granted during period	$ 18.45
Options forfeited/cancelled during period			$ 18.45
Options outstanding end of period		$ 18.45	$ 18.45
Such value was estimated on the grant date using a binomial lattice option pricing model using the following assumptions:
Compensation expense related to stock options		$ 24,000	$ 71,000
Unrecognized compensation cost		384,000	$ 384,000
Unrecognized compensation cost, recognition period			5 years
Aggregate intrinsic value of options outstanding		$ 439,020	$ 439,020