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Segment information - Sales by geographic area (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Revenue, Major Customer [Line Items]
Sales revenue	$ 55,325	$ 50,196
United States
Revenue, Major Customer [Line Items]
Sales revenue	54,365	49,534
Foreign countries, total
Revenue, Major Customer [Line Items]
Sales revenue	960	662
Canada
Revenue, Major Customer [Line Items]
Sales revenue	592	547
Mexico
Revenue, Major Customer [Line Items]
Sales revenue	109	39
All other
Revenue, Major Customer [Line Items]
Sales revenue	$ 259	$ 76

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+ References

No definition available.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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