Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details Textual)

v2.4.0.6
Basis of Presentation (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
employees
Dec. 31, 2011
Mar. 31, 2012
Dec. 31, 2012
Sale of Conference Plus, Inc [Member]
Mar. 31, 2012
Sale of Conference Plus, Inc [Member]
Dec. 31, 2011
Sale of Conference Plus, Inc [Member]
Dec. 31, 2012
Sale of Customer Networking Solutions Assets [Member]
Sep. 30, 2012
Sale of Customer Networking Solutions Assets [Member]
Dec. 31, 2011
Sale of Customer Networking Solutions Assets [Member]
Mar. 31, 2012
Sale of Customer Networking Solutions Assets [Member]
Dec. 31, 2012
ANTONE Wireless Corporation [Member]
May 15, 2012
ANTONE Wireless Corporation [Member]
employees
Dec. 31, 2012
Technology [Member]
May 15, 2012
Technology [Member]
Dec. 31, 2012
Customer Relationships [Member]
May 15, 2012
Customer Relationships [Member]
Business Acquisition [Line Items]                                    
Proceeds from CNS asset sale     $ 0 $ 36,683,000             $ 36,700,000              
Basis of Presentation (Textual) [Abstract]                                    
Number of employees affected by planned relocation     35                              
Amount of rights of ANTONE products                           2,524,000        
Contingent cash consideration 3,500,000   3,500,000                     3,500,000        
Number of Employees Hired                           9        
Acquired intangible assets from ANTONE                           3,230,000   2,800,000   400,000
Estimated useful lives for acquired intangible assets                             8 years   8 years  
Warranty obligation for pre-acquisition sales made by ANTONE 0 0   0                 303,000          
Pre-acquisition warranty costs                         25,000          
Sale of conference plus               40,300,000                    
Escrow deposit made           4,100,000 4,100,000         3,400,000   3,000        
DISCO Loss Contingency, Loss in Period 1,500,000                                  
Pre-tax gain on CNS asset sale 0 0 0 31,654,000             31,654,000              
Escrow Deposit Released                 700,000 2,600,000                
Litigation Settlement, Gross                 900,000                  
Loss Contingency Accrual, at Carrying Value 1,900,000   1,900,000   800,000             400,000            
Additional expense related to CNS claim                   $ 500,000