Stock option plan (Schedule of Stock Option Activity) (Details) - Employee Stock Option [Member] - USD ($)					6 Months Ended
	May 04, 2019	May 03, 2018	Nov. 10, 2016	Sep. 04, 2014	Apr. 30, 2019
No. of Options Outstanding
Options outstanding beginning of period	$ 172,000				$ 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
Options vested and expected to vest					303,990
Options exercisable at end of period					211,260
Weighted Average Exercise Price
Options outstanding beginning of period	$ 18.35				$ 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