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Aircraft and Aircraft Engines Held for Lease or Sale (Details)	1 Months Ended				3 Months Ended	12 Months Ended
	Feb. 28, 2018 Aircraft	Jan. 31, 2018 USD ($) Aircraft	May 31, 2016 USD ($)	Apr. 30, 2016 Aircraft	Mar. 31, 2018 Aircraft	Dec. 31, 2017 USD ($) Asset Aircraft	Dec. 31, 2016 USD ($) Aircraft Asset
Aircraft and aircraft engines held for lease or sale [Abstract]
Payment for equipment and acquisition costs related to aircraft purchased						$ 7,614,200	$ 0
Proceeds from insurance						0	18,886,700
Gain (loss) on sale of aircraft and aircraft parts						791,500	2,149,600
Proceeds from the sale of airframe parts						193,000	3,422,800
Impairment charge						1,002,100	$ 1,226,800
Minimum future lease revenue payments receivable under noncancelable operating leases [Abstract]
2018						24,743,000
2019						24,641,300
2020						23,003,000
2021						15,901,600
2022						13,944,000
Thereafter						29,447,400
Total						$ 131,680,300
Regional Jet Aircraft [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Number owned \| Aircraft						13	12
Percentage of net book value						82.00%	73.00%
Turboprop Aircraft [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Number owned \| Aircraft						10	12
Percentage of net book value						17.00%	23.00%
Turboprop Aircraft [Member] \| Subsequent Events [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Gain (loss) on sale of aircraft and aircraft parts		$ 47,000
Number of aircraft sold \| Aircraft	1	1
Engines [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Number owned \| Aircraft						1	4
Percentage of net book value						1.00%	4.00%
Held for Lease [Member] \| Subsequent Events [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Number of aircraft sold \| Aircraft					2
Held for Lease [Member] \| Turboprop Aircraft [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Number of aircraft involved in accident \| Aircraft				1
Proceeds from insurance			$ 17,640,000
Gain from insurance			$ 2,146,500
Held for Lease [Member] \| Aircraft [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Percentage of net book value						13.00%
Payment for equipment and acquisition costs related to aircraft purchased						$ 32,063,100	$ 54,357,600
Proceeds from maintenance reserves							$ 17,179,300
Number of aircraft for which maintenance reserve received \| Aircraft							2
Gain (loss) on sale of aircraft and aircraft parts						$ 704,100
Number of aircraft sold \| Asset						7	1
Number of assets lease extended \| Asset						1
Number of assets off lease \| Aircraft						8
Held for Sale [Member] \| Regional Jet Aircraft [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Number of aircraft sold \| Aircraft							4
Impairment charge							$ 75,000
Number of aircraft impaired \| Aircraft							2
Held for Sale [Member] \| Spare Engine [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Impairment charge						$ 246,200
Held for Sale [Member] \| Aircraft [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Number of assets held for sale \| Aircraft						3
Held for Sale [Member] \| Aircraft Parts [Member]
Aircraft and aircraft engines held for lease or sale [Abstract]
Gain (loss) on sale of aircraft and aircraft parts						$ 87,400	$ 3,100
Accrued receivables						779,700
Proceeds from the sale of airframe parts						193,100	178,400
Carrying value of parts sold						$ 885,400	$ 175,300