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Credit Facility (Tables)
12 Months Ended
Mar. 31, 2013
Debt Disclosure [Abstract]  
Summary of activity on the Bank of America, N.A. line of credit
  Principal
Balance at April 1, 2012: $    1,700,000
  Borrowings 1,600,000
  Repayments (350,000)
Balance at March 31, 2013: $     2,950,000