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