Annual report pursuant to Section 13 and 15(d)

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