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Sales by geographic area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Revenue, Major Customer [Line Items]
Sales revenue	$ 10,647	$ 7,966
United States
Revenue, Major Customer [Line Items]
Sales revenue	10,470	7,764
Canada
Revenue, Major Customer [Line Items]
Sales revenue	165	153
Mexico
Revenue, Major Customer [Line Items]
Sales revenue	0	39
All other
Revenue, Major Customer [Line Items]
Sales revenue	12	10
Foreign countries, total
Revenue, Major Customer [Line Items]
Sales revenue	$ 177	$ 202

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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
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-Publisher FASB
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