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Investments in Finance Leases (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Investment, Finance Leases    
Minimum rents receivable $ 9,209,627 $ 8,319,597
Estimated unguaranteed residual value 535,791 465,151
Unearned income (2,216,469) (1,944,158)
Investment, finance leases $ 7,528,949 $ 6,840,590