Stock option plan (Narrative) (Details) - USD ($)
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3 Months Ended |
6 Months Ended |
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May 04, 2019 |
May 03, 2018 |
Nov. 10, 2016 |
Sep. 04, 2014 |
Apr. 30, 2019 |
Apr. 30, 2018 |
Apr. 30, 2019 |
Apr. 30, 2018 |
Oct. 31, 2018 |
| Equity Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Increase in number of shares authorized |
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300,000
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| Shares available for issuance |
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442,060
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442,060
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| Employee Stock Option [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Plan term |
10 years
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10 years
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10 years
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10 years
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| Vesting term |
5 years
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5 years
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5 years
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5 years
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5 years
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| Options granted during period |
5,000
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38,000
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38,000
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246,000
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5,000
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| Options granted during period, price per share |
$ 15.00
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$ 15.50
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$ 21.00
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$ 18.45
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$ 15.00
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| Compensation expense related to stock options |
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$ 35,000
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$ 30,000
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$ 69,000
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$ 61,000
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| Unrecognized compensation cost |
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172,000
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172,000
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$ 305,780
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| Unrecognized compensation cost, recognition period |
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2 years 6 months
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| Aggregate intrinsic value of options expected to vest |
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55,000
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55,000
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| Aggregate intrinsic value of options exercisable |
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