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Finance Leases Receivable (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Net Investment Included in Finance Leases and Direct Financing Leases Receivable [Abstract]    
Gross minimum lease payments receivable $ 26,027,700 $ 27,074,400
Less unearned interest (3,134,300) (3,513,400)
Finance leases receivable 22,893,400 23,561,000
Minimum Future Payments Receivable under Finance Leases [Abstract]    
Remainder of 2018 5,215,500  
2019 7,087,600  
2020 5,036,600  
2021 5,381,000  
2022 3,307,000  
Total $ 26,027,700 $ 27,074,400