Notes Payable and Accrued Interest, Credit Facility (Details)				12 Months Ended
	Feb. 19, 2019 USD ($)	Feb. 08, 2019 USD ($) Aircraft	Oct. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) Asset
Credit Facility [Abstract]
Principal payment				$ 32,600,000	$ 12,000,000
Gain (loss) on sale of aircraft and aircraft parts				(3,408,700)	791,500
Term Loans [Member] | Subsequent Event [Member]
Credit Facility [Abstract]
Non-recourse term loan		$ 44,310,000
Number of aircraft refinanced under previous Credit Facility | Aircraft		4
Number of aircraft refinanced under SPE Financing | Aircraft		2
Credit Facility [Member]
Credit Facility [Abstract]
Credit facility current borrowing capacity				170,000,000
Credit facility maximum borrowing capacity				$ 180,000,000
Date of expiration				May 31, 2019
Number of assets held for sale | Asset						4
Borrowing base deficiency						$ 1,400,000
Principal payment			$ 2,000,000
Gain (loss) on sale of aircraft and aircraft parts				$ (3,408,700)
Unused amount of the credit facility				$ 47,600,000	$ 36,000,000
Weighted average interest rate on credit facility				5.92%	5.21%
Credit Facility [Member] | Subsequent Event [Member]
Credit Facility [Abstract]
Credit facility current borrowing capacity	$ 145,000,000
Credit facility maximum borrowing capacity	$ 160,000,000
Date of expiration	Feb. 19, 2023
Fees and penalties under waiver	$ 0