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Investment in Sales-Type Leases, Net (Details 1) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Investment in Sales-Type Leases, Net [Abstract]    
2019 $ 43,934,770  
2020 19,852,167  
2021 21,438,438  
2022 22,465,382  
2023 18,674,218  
Thereafter 87,744,086  
Total $ 214,109,061 $ 222,132,929