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Business acquisitions, Pro Forma Information (Detail) - Rel-Tech Electronics, Inc [Member] - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2015 | Jul. 31, 2015
Revenue | $ 8,860,000 | $ 26,029,000
Net income | $ 144,000 | $ 688,000
Earnings per share |  |
Basic | $ 0.02 | $ 0.08
Diluted | $ 0.02 | $ 0.08

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