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Business acquisitions - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 19, 2015 | Jan. 20, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | Jun. 05, 2015
Payments to Acquire Businesses, Gross |  |  | $ 2,100,000 |  |
Revenues |  |  | 30,241,000 | $ 30,908,000 |
Selling, General and Administrative Expense |  |  | 9,560,000 | 8,888,000 |
Accrued Earn Out Liability |  |  | 707,000 | 1,150,000 |
Rel-Tech Electronics, Inc |  |  |  |  |
Business Acquisition, Additional Payment In Cash |  |  | $ 800,000 |  |
Business Acquisition Unregistered Common Stock Shares |  |  | 50,467 |  |
Description For President Annual Bonus |  |  | 318,000 |  |
Business Acquisition Unregistered Common Stock Value |  |  | $ 200,000 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 100.00%
Payments to Acquire Businesses, Gross |  |  | $ 3,100,000 |  |
Business Acquisition, Share Price |  |  | $ 3.96 |  |
Revenues |  |  | $ 6,800,000 | 3,100,000 |
Selling, General and Administrative Expense |  |  | 154,000 |  |
Accrued Earn Out Liability Current |  |  | 322,000 |  |
Accrued Earn Out Liability |  |  | 450,000 |  |
Accrued Earn Out Liability Non Current |  |  | 128,000 |  |
Rel-Tech Electronics, Inc | Palumbo |  |  |  |  |
Salary Payable To President |  |  | $ 150,000 |  |
Description For President Annual Bonus |  |  | earn an annual bonus of up to 50% of his base salary. |  |
CompPro Product Line |  |  |  |  |
Business Acquisition Cost Of Acquired Entity Purchase Price value | $ 700,000 |  |  |  |
Payments to Acquire Businesses, Gross | 700,000 |  |  |  |
Business Acquisition Cost Of Acquired Entity Purchases Price | $ 700,000 |  |  |  |
Comnet Telecom Supply Inc |  |  |  |  |
Business Acquisition Cost Of Acquired Entity Purchase Price value |  |  | $ 1,060,000 |  |
Business Acquisition Unregistered Common Stock Shares |  |  | 252,381 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00% |  |
Payments to Acquire Businesses, Gross |  |  | $ 3,090,000 |  |
Business Acquisition, Share Price |  |  | $ 4.20 |  |
Revenues |  |  | $ 9,100,000 | 10,300,000 |
Business Acquisition Cost Of Acquired Entity Purchases Price |  |  | 4,150,000 |  |
Selling, General and Administrative Expense |  |  | 56,000 | $ 318,000 |
Accrued Earn Out Liability Current |  |  | 385,000 |  |
Escrow Deposit Disbursements Related to Property Acquisition |  |  | 300,000 |  |
Comnet Telecom Supply Inc | Mr. Portera |  |  |  |  |
Business Acquisition Cost Of Acquired Entity Purchase Price value |  |  | 4,150,000 |  |
Business Acquisition, Additional Payment In Cash |  |  | $ 1,360,000 |  |
Description For President Annual Bonus |  |  | earn an annual bonus of up to 50% of his base salary. |  |
Business Combination, Consideration Transferred |  | $ 210,000 |  |  |

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