Annual report pursuant to Section 13 and 15(d)

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Goodwill and Intangible Assets (Details Textual)

v3.4.0.3

Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Sep. 01, 2014
Goodwill [Line Items]
Goodwill	$ 0				$ 0	$ 0	$ 31,997
Goodwill impairment	0	$ 20,547	$ 11,450	$ 0	0	31,997	0
Finite-Lived Intangible Assets, Net	25,942				20,388	25,942
Indefinite-lived Intangible Assets, Impairment Losses						0	0
Intangible amortization					5,554	6,377	4,889
Impairment of Intangible Assets (Excluding Goodwill)					$ 0	100
Minimum [Member]
Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life					2 years
Maximum [Member]
Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life					10 years
Product Technology [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Net	7,864				$ 5,779	7,864
Product Technology [Member] \| Noran Tel [Member]
Goodwill [Line Items]
Impairment of Intangible Assets, Finite-lived							200
Finite-Lived Intangible Assets, Net							200
Finite-Lived Intangible Asset, Useful Life					2 years
Kentrox [Member]
Goodwill [Line Items]
Goodwill							11,450
IBW [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount								13.00%
Goodwill	0		$ 20,500		$ 0	0	0
Goodwill impairment						20,547
CSI [Member]
Goodwill [Line Items]
Goodwill							20,547
CSG [Member]
Goodwill [Line Items]
Goodwill	$ 0				$ 0	0	$ 0
Goodwill impairment						$ 11,450

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 45
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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

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