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Investment in Sales-Type Leases, Net (Details 1) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Investments [Abstract]    
2020 $ 24,146,507  
2021 6,633,017  
2022 6,633,017  
2023 6,633,017  
2024 6,633,017  
Thereafter 6,633,017  
Total $ 57,311,592 $ 88,661,266