Finance Leases Receivable (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) Aircraft	Dec. 31, 2015 USD ($) Aircraft
Loans And Leases Receivable Disclosure [Line Items]
Number of aircraft held for lease | Aircraft		5
Gain on finance lease	$ 1,216,700	$ 5,179,200
Net Investment [Abstract]
Gross minimum lease payments receivable	20,829,200	14,074,500
Less unearned interest	(3,360,900)	(2,178,900)
Finance leases receivable	17,468,300	11,895,600
Minimum Future Lease Revenue Payments [Abstract]
2017	3,459,600
2018	3,663,600
2019	4,939,600
2020	2,727,600
2021	3,660,800
Thereafter	2,378,000
Total	$ 20,829,200	14,074,500
Turboprop Aircraft [Member] | Operating Lease [Member]
Loans And Leases Receivable Disclosure [Line Items]
Gain on finance lease		$ 916,400
Number of assets lease extended | Aircraft		2
Turboprop Aircraft [Member] | Financing Lease [Member]
Loans And Leases Receivable Disclosure [Line Items]
Number of aircraft held for lease | Aircraft	3	3
Gain on finance lease	$ 1,208,100	$ 4,262,800
Number of aircraft sold | Aircraft	2
Additional gain on finance lease	$ 8,600