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Fair Value (Tables)
9 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value
 
         
Fair Value Measurement at December 31, 2012 Using
 
         
Quoted Prices
   
Significant
       
         
in Active
   
Other
   
Significant
 
         
Markets for
   
Observable
   
Unobservable
 
 
December 31,
 
Identical Assets
   
Inputs
   
Inputs
 
  (In thousands)
 
2012
   
(Level 1)
   
(Level 2)
   
(Level 3)
 
  Assets:
                       
Cash and cash equivalents - 
money market funds
  $ 30,018     $ 30,018     $ -     $ -  
Short term investments - 
bond mutual funds
    15,455       15,455       -       -  
    $ 45,473     $ 45,473     $ -     $ -