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Investment in Sales-Type Leases, Net (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Investment in Sales-Type Leases, Net [Abstract]    
Total future minimum lease payments receivable $ 220,128,619 $ 217,470,913
Less: executory cost (66,859,949) (66,444,519)
Less: unearned interest income (32,395,946) (35,312,473)
Less: realized interest income but not yet received (7,695,920) (4,621,490)
Investment in sales-type leases, net 113,176,804 111,092,431
Current portion 12,552,397 9,385,453
Noncurrent portion $ 100,624,407 $ 101,706,978