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Investment in Sales-Type Leases, Net (Details 1) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Investments [Abstract]    
2020 $ 22,959,826  
2021 6,772,110  
2022 6,772,110  
2023 6,772,110  
2024 6,772,110  
Thereafter 8,465,137  
Total $ 58,513,403 $ 88,661,266