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Income tax provision - Additional Information (Detail) - USD ($)	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Dec. 31, 2017	Oct. 31, 2017
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	38.10%	35.00%
Unrecognized tax benefits, inclusive of interest and penalties	$ 2,000	$ 6,000
Unrecognized tax benefits	$ 80,000	$ 59,000		$ 0
Provision For Income Tax Expense Percent	22.70%	19.60%
Income Tax Expense (Benefit)	$ 1,036,000	$ 1,468,000
US federal and California [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 72,000	$ 53,000

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Income Taxes [Line Items]

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Percenatge of provision of income tax expense.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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