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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Mar. 31, 2014
Accounting Policies [Abstract]  
Schedule of comprehensive income
   
March 31,
 
   
2014
   
2013
   
2012
 
                   
Net income
  $ 17,972     $ 17,165     $ 16,659  
Net change in unrealized gain (loss) on short term investments
    (35 )     (46 )     75  
Redemptions on long term investments
    -       -       110  
Comprehensive income
  $ 17,937     $ 17,119     $ 16,844