Finance Leases Receivable (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Net Investment Included in Finance Leases and Direct Financing Leases Receivable [Abstract]
Gross minimum lease payments receivable	$ 24,839,100	$ 27,074,400
Less unearned interest	(2,773,000)	(3,513,400)
Finance leases receivable	22,066,100	$ 23,561,000
Minimum Future Payments Receivable under Finance Leases [Abstract]
Remainder of 2018	4,026,900
2019	7,087,600
2020	5,036,600
2021	5,381,000
2022	3,307,000
Total	$ 24,839,100