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Investment in Sales-Type Leases, Net (Details 1) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Investments [Abstract]    
2019 $ 36,251,311  
2020 12,414,034  
2021 12,414,034  
2022 10,971,558  
2023 6,644,132  
Thereafter 9,966,197  
Total $ 88,661,266 $ 99,155,214