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Notes Payable and Accrued Interest (Details)
Aug. 31, 2016
USD ($)
Aircraft
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Credit Facility [Abstract]      
Unamortized debt issuance costs   $ (1,817,200) $ (2,216,000)
Special purpose financing [Abstract]      
Notes payable and accrued interest   133,768,100 145,598,200
SPE Financing [Member]      
Special purpose financing [Abstract]      
Principal   12,452,600 13,511,900
Interest rate 4.455%    
Accrued interest   21,600 23,400
Notes payable and accrued interest   12,474,200 13,535,300
SPE Financing [Member] | October 3, 2020 [Member]      
Special purpose financing [Abstract]      
Principal $ 9,805,600    
SPE Financing [Member] | November 7, 2020 [Member]      
Special purpose financing [Abstract]      
Principal $ 9,804,300    
SPE Financing [Member] | Regional Jet Aircraft [Member]      
Special purpose financing [Abstract]      
Number of aircraft purchased | Aircraft 2    
Credit Facility [Member]      
Credit Facility [Abstract]      
Principal   123,000,000 134,000,000
Unamortized debt issuance costs   (1,817,200) (2,216,000)
Credit facility current borrowing capacity   170,000,000  
Credit facility maximum borrowing capacity   180,000,000  
Unused amount of the credit facility   $ 47,000,000 $ 36,000,000
Weighted average interest rate on credit facility   5.30% 5.21%
Special purpose financing [Abstract]      
Accrued interest   $ 111,100 $ 278,900