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Sales by geographic area (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Oct. 31, 2017 | Oct. 31, 2016
Revenue, Major Customer [Line Items] |  |
Sales revenue | $ 30,964 | $ 30,241
United States |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 30,232 | 29,257
Canada |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 483 | 509
Israel |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 0 | 63
Mexico |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 78 | 234
All other |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 171 | 178
Foreign countries, total |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | $ 732 | $ 984

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