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Sales by geographic area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Revenue, Major Customer [Line Items]
Sales revenue	$ 15,511	$ 11,820	$ 39,784	$ 40,302
United States
Revenue, Major Customer [Line Items]
Sales revenue	15,154	11,652	39,075	39,790
Canada
Revenue, Major Customer [Line Items]
Sales revenue	156	142	433	421
Mexico
Revenue, Major Customer [Line Items]
Sales revenue	109	0	109	39
All other
Revenue, Major Customer [Line Items]
Sales revenue	92	26	167	52
Foreign countries, total
Revenue, Major Customer [Line Items]
Sales revenue	$ 357	$ 168	$ 709	$ 512

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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
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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