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Discontinued operations - Additional Information (Details) - USD ($)	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Business Acquisition
Business Combination, Consideration Transferred		$ 4,200,000
Discontinued Operation, Tax Effect of Discontinued Operation	$ 0	41,000
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, before Income Tax		$ 221,000
Issued And Outstanding Shares Percentage for sold of subsidiary		100.00%

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The percentage of Issued And Outstanding Shares for sold of subsidiary.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount before tax of an increase (decrease) to a gain (loss) previously reported in discontinued operations in a prior period.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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