Finance Leases Receivable (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Loans And Leases Receivable Disclosure [Line Items]
Net gain on sales-type finance leases	$ 42,000	$ 2,681,900	$ 47,400	$ 4,083,800
Net Investment [Abstract]
Gross minimum lease payments receivable	13,808,500		13,808,500		$ 14,074,500
Less unearned interest	(2,055,000)		(2,055,000)		(2,178,900)
Finance leases receivable	11,753,500		11,753,500		11,895,600
Minimum Future Lease Revenue Payments [Abstract]
Remainder of 2016	1,547,800		1,547,800
2017	2,564,100		2,564,100
2018	2,331,600		2,331,600
2019	3,607,600		3,607,600
2020	1,395,600		1,395,600
Thereafter	2,361,800		2,361,800
Total	13,808,500		$ 13,808,500		$ 14,074,500
Turboprop Aircraft [Member] | Financing lease [member]
Loans And Leases Receivable Disclosure [Line Items]
Net gain on sales-type finance leases	$ 42,000	2,535,100
Turboprop Aircraft [Member] | Renegotiated Financing Lease [Member]
Loans And Leases Receivable Disclosure [Line Items]
Net gain on sales-type finance leases		$ 146,800