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Credit Facility (Tables)
6 Months Ended
Sep. 30, 2012
Debt Disclosure [Abstract]  
Summary of activity on the Bank of America, N.A. line of credit
   Principal
Balance at March 31, 2012:  $1,700,000 
Borrowings   300,000 
Repayments   (225,000)
Balance at September 30, 2012:  $1,775,000