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Sale of Aviel Electronics division - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 22, 2015 | Jul. 31, 2015 | Jul. 31, 2016 | Jul. 31, 2015
Notes Payable, Other Payables [Member] |  |  |  |
Debt Instrument, Term | 3 years |  |  |
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 |  | $ 225,000 | $ 86,000 | $ 770,000
Income (Loss) from Continuing Operations before Interest Expense, Interest Income, Income Taxes, Extraordinary Items, Noncontrolling Interests, Net |  | $ 36,000 | 40,000 | $ 142,000
Aviel Electronics Division [Member] | Notes Payable, Other Payables [Member] |  |  |  |
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 |  |  | $ 118,000 |
Promissory Note [Member] | Aviel Electronics Division [Member] | Notes Payable, Other Payables [Member] |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts Payable | $ 250,000 |  |  |

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