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Fair Value (Tables)
 3 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value
          Fair Value Measurement at June 30, 2015 Using  
          Quoted Prices     Significant        
          in Active     Other     Significant  
          Markets for     Observable     Unobservable  
    June 30,     Identical Assets     Inputs     Inputs  
 (In thousands)   2015     (Level 1)     (Level 2)     (Level 3)  
 Assets:                        
    Cash and cash equivalents -                        
       money market funds   $ 42,685     $ 42,685     $ -     $ -  
    Short term investments -                                
       bond mutual funds     15,572       15,572       -       -  
                                 
    $ 58,257     $ 58,257     $ -     $ -