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Business activities and summary of significant accounting policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Mar. 15, 2019
Business Activities And Summary Of Significant Accounting Policies [Line Items]
Amortization of Intangible Assets	$ 275,000	$ 275,000
Advertising Expense	231,000	236,000
Research and Development Expense	1,468,000	1,480,000
Stock based compensation expense	$ 317,000	$ 211,000
Shares excluded from computation of diluted per share amount	124,097	133,220
Present Value of Future Insurance Profits, Weighted Average Amortization Period	10 years 11 months 23 days
Income Tax Expense (Benefit)	$ 1,036,000	$ 1,468,000
Goodwill from business Acquisition	$ 1,340,000	$ 1,340,000
C Enterprises Inc [Member]
Business Activities And Summary Of Significant Accounting Policies [Line Items]
Goodwill from business Acquisition			$ 0
Maximum [Member]
Business Activities And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Minimum [Member]
Business Activities And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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