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Sale of Aviel Electronics division - Additional Information (Detail) - USD ($)	1 Months Ended	9 Months Ended
	Dec. 22, 2015	Jul. 31, 2017	Jul. 31, 2016
Gain (Loss) on Disposition of Assets, Total		$ 0	$ (61,000)
Aviel Electronics Division [Member]
Gain (Loss) on Disposition of Assets, Total	$ 35,000
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	$ 150,000
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Revenue			86,000
Income (Loss) from Continuing Operations before Interest Expense, Interest Income, Income Taxes, Extraordinary Items, Noncontrolling Interests, Net			$ 40,000
Aviel Electronics Division [Member] \| Notes Payable, Other Payables [Member]
Debt Instrument, Term	3 years
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Promissory Note [Member] \| Aviel Electronics Division [Member] \| Other Current Assets [Member]
Disposal Group, Including Discontinued Operation, Accounts Payable		83,000
Promissory Note [Member] \| Aviel Electronics Division [Member] \| Other Assets [Member]
Disposal Group, Including Discontinued Operation, Accounts Payable		$ 42,000
Promissory Note [Member] \| Aviel Electronics Division [Member] \| Notes Payable, Other Payables [Member]
Disposal Group, Including Discontinued Operation, Accounts Payable	$ 250,000