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Business acquisitions - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 02, 2015	Nov. 02, 2014	May. 19, 2015	Jan. 31, 2016	Jan. 31, 2015	Oct. 31, 2015	Jun. 05, 2015
Payments to Acquire Businesses, Gross				$ 2,100,000
Revenues				6,984,000	$ 6,894,000
Selling, General and Administrative Expense				2,489,000	$ 2,257,000
Rel-Tech Electronics, Inc
Business Acquisition, Additional Payment In Cash				$ 800,000
Business Acquisition Unregistered Common Stock Shares				50,467
Business Acquisition Unregistered Common Stock Value				$ 200,000
Business Acquisition, Percentage of Voting Interests Acquired							100.00%
Payments to Acquire Businesses, Gross	$ 2,100,000			$ 3,100,000
Business Combination, Consideration Transferred	610,000
Business Acquisition, Share Price				$ 3.96
Revenues				$ 1,500,000
Business Acquisition Cost Of Acquired Entity Purchases Price	$ 2,910,000
Rel-Tech Electronics, Inc | Palumbo
Salary Payable To President				150,000
CompPro Product Line
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, Additional Payment In Cash				$ 300,000
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 Combination, Consideration Transferred		1,235,000
Revenues				$ 2,200,000
Business Acquisition Cost Of Acquired Entity Purchases Price		$ 5,385,000
Selling, General and Administrative Expense						$ 318,000
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
Business Combination, Consideration Transferred				$ 210,000
Business Acquisition, Share Price				$ 4.20
Business Acquisition Cost Of Acquired Entity Purchases Price				$ 4,150,000

X

- Definition

Amount of additional cash payments during the period.

+ References

No definition available.

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- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

No definition available.

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- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

No definition available.

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- Definition

Value of all classes of common stock held by shareholders. May be all or portion of the number of unregistered Common Stock Shares

+ References

No definition available.

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Unregistered common stock value relates to the business acquisition.

+ References

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- Definition

This element refers amount of salary payable to president.

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No definition available.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

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