Organization and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) Subsidiary Aircraft Lease	Dec. 31, 2016 USD ($) Aircraft
Organization and Summary of Significant Accounting Policies [Abstract]
Number of wholly owned subsidiaries | Subsidiary	2
Aircraft Capitalization and Depreciation [Abstract]
Aircraft useful life	12 years
Capital Leased Assets [Line Items]
Impairment charge	$ 1,002,100	$ 1,226,800
Notes payable and accrued interest	145,598,200	125,837,900
Impairment of Long-lived Assets [Abstract]
Provision for impairment in value of aircraft	1,002,100	1,226,800
Revenue Recognition, Accounts Receivable and Allowance for Doubtful Accounts [Abstract]
Allowance for doubtful accounts	$ 0	0
Finance Leases [Abstract]
Number of aircraft with sales type finance leases | Aircraft	6
Number of aircraft with direct financing leases | Aircraft	3
Number of finance leases | Lease	9
Interest earned on finance lease	$ 1,571,500	868,100
SPE Financing [Member]
Capital Leased Assets [Line Items]
Notes payable and accrued interest	13,535,300	17,654,200
Credit Facility [Member]
Capital Leased Assets [Line Items]
Notes payable and accrued interest	134,278,900	110,183,600
Recurring [Member]
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis [Abstract]
Money market funds included in cash and cash equivalents	6,151,900	1,348,100
Liabilities recorded at fair value	0	0
Aircraft [Member] | Held for Lease [Member]
Capital Leased Assets [Line Items]
Impairment charge	1,002,100	905,600
Impairment of Long-lived Assets [Abstract]
Provision for impairment in value of aircraft	1,002,100	905,600
Aircraft [Member] | Held for Sale [Member]
Capital Leased Assets [Line Items]
Impairment charge	0	$ 321,200
Number of aircraft held for sale | Aircraft		3
Impairment of Long-lived Assets [Abstract]
Provision for impairment in value of aircraft	$ 0	$ 321,200