Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details Textual)

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Commitments and Contingencies (Details Textual) (USD $)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Loss Contingencies [Line Items]      
Operating Leases, Rent Expense, Net $ 2,800,000 $ 2,300,000 $ 2,200,000
Operating Leases, Income Statement, Sublease Revenue 100,000 100,000 400,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 3,500,000 3,500,000  
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 2,641,000 2,333,000 0
Sale of Conference Plus Inc [Member]
      
Loss Contingencies [Line Items]      
Loss Contingency Accrual, at Carrying Value 700,000 1,700,000  
Cns Asset Sale [Member]
      
Loss Contingencies [Line Items]      
Loss Contingency, Loss in Period   500,000  
Litigation Settlement, Expense   900,000  
Loss Contingency, Estimate of Possible Loss     400,000
Aurora lease [Member]
      
Loss Contingencies [Line Items]      
Area of Real Estate Property 185,000    
Lease Expiration Date Sep. 30, 2017    
Payments for Rent 2,000,000    
Percent rent increase every other year 2.00%    
Deferred Rent Credit, Noncurrent 417,000 551,000  
Deferred Rent Credit, Current $ 134,000 $ 114,000  
Kentrox office lease [Member]
      
Loss Contingencies [Line Items]      
Area of Real Estate Property 47,000    
Lease Expiration Date Oct. 31, 2014    
Ohio design lease [Member]
      
Loss Contingencies [Line Items]      
Area of Real Estate Property 9,465    
Lease Expiration Date Sep. 30, 2019    
CSI dist lease [Member]
      
Loss Contingencies [Line Items]      
Area of Real Estate Property 16,932    
Lease Expiration Date Aug. 31, 2018    
Regina Canada lease [Member]
      
Loss Contingencies [Line Items]      
Area of Real Estate Property 2,500    
Lease Expiration Date Oct. 31, 2017    
CSI office lease [Member]
      
Loss Contingencies [Line Items]      
Area of Real Estate Property 19,525    
Lease Expiration Date Apr. 30, 2018