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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 $ 33,385,727  
2020 12,876,704  
2021 12,876,704  
2022 12,876,704  
2023 8,387,994  
Thereafter 13,783,514  
Total $ 94,187,347 $ 99,155,214