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Stock-based compensation and equity transactions - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Apr. 30, 2017	Jan. 31, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Oct. 31, 2017	Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining life of options outstanding				4 years 14 days
Weighted average remaining contractual life of options exercisable				3 years 3 months 4 days
Weighted average life of options vested and expected to vest				4 years 14 days
Aggregate intrinsic value of options outstanding	$ 107,000			$ 107,000
Aggregate intrinsic value of options exercisable	92,000			92,000
Aggregate intrinsic value of options vested and expected to vest	107,000			107,000
Non-vested stock-based arrangements yet to be recognized	311,000			$ 311,000
Stock based arrangements yet to be recognized, weighted average period expected to be recognized				3 years 4 days
Non-employee director annual grant							$ 30,000
Options granted for each non-employee director		77,339
Value of stock option issued				$ 25,000
Stock based compensation expense	$ 48,000		$ 51,000	99,000	$ 102,000
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-employee director annual grant						$ 50,000
Fair value of stock option						$ 0.32
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense				6,000	17,000
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense				$ 93,000	$ 85,000

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Share based goods and nonemployee services transaction value of stock option issued.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

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Price of a single share of a number of saleable stocks of a company.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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