Annual report pursuant to Section 13 and 15(d)

Restructuring Charge (Details Textual)

v3.3.0.814
Restructuring Charge (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Mar. 31, 2015
USD ($)
employees
Mar. 31, 2014
USD ($)
employees
Mar. 31, 2013
USD ($)
employees
Mar. 31, 2012
USD ($)
Restructuring Charge (Textual) [Abstract]                    
Restructuring $ 3,188,000 $ 57,000 $ 62,000 $ 38,000 $ 169,000 $ 66,000 $ 3,243,000 $ 335,000 $ 149,000  
Accrued restructuring 1,161,000   57,000       1,161,000 57,000    
Accrued restructuring non-current 1,642,000   0       1,642,000 0    
Payments for Restructuring             425,000 284,000 756,000  
Unpaid balance of restructuring charges 2,803,000   57,000       $ 2,803,000 $ 57,000 $ 6,000 $ 613,000
4Q15 Restructuring [Member]                    
Restructuring Charge (Textual) [Abstract]                    
Restructuring and Related Cost, Number of Positions Eliminated | employees             17      
Restructuring 3,200,000                  
Impairment of Leasehold 2,700,000                  
Kentrox [Member]                    
Restructuring Charge (Textual) [Abstract]                    
Restructuring and Related Cost, Number of Positions Eliminated | employees               12    
Restructuring             $ 55,000 $ 335,000    
Payments for Restructuring               278,000    
Cumulative Restructuring             390,000      
Noran Tel Restructuring [Member]                    
Restructuring Charge (Textual) [Abstract]                    
Restructuring and Related Cost, Number of Positions Eliminated | employees                 35  
Restructuring                 $ 149,000  
Cumulative Restructuring                 424,000  
Employee Related Restructuring Cost [Member]                    
Restructuring Charge (Textual) [Abstract]                    
Restructuring             337,000 335,000 89,000  
Accrued restructuring     57,000         57,000    
Payments for Restructuring             379,000 284,000 644,000  
Unpaid balance of restructuring charges $ 15,000   $ 57,000       $ 15,000 $ 57,000 $ 6,000 $ 561,000