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Investment in Sales-Type Leases, Net (Details 1) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Investment in Sales-Type Leases, Net [Abstract]    
2019 $ 43,576,604  
2020 20,889,274  
2021 22,603,270  
2022 22,680,747  
2023 21,224,190  
Thereafter 96,889,295  
Total $ 227,863,380 $ 218,176,104