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Investment in Sales-Type Leases, Net (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Investment in Sales-Type Leases, Net [Abstract]    
Total future minimum lease payments receivable $ 381,384,263 $ 387,612,418
Less: executory cost (91,850,486) (93,054,738)
Less: unearned interest income (150,638,976) (154,799,027)
Investment in sales-type leases, net 138,894,801 139,758,653
Current portion 6,925,405 6,679,019
Noncurrent portion $ 131,969,396 $ 133,079,634