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Notes Payable and Accrued Interest (Details)
6 Months Ended
Aug. 31, 2016
USD ($)
Aircraft
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Credit Facility [Abstract]      
Unamortized debt issuance costs   $ (1,483,500) $ (2,216,000)
Special purpose financing [Abstract]      
Notes payable and accrued interest   147,642,500 145,598,200
SPE Financing [Member]      
Special purpose financing [Abstract]      
Principal   11,384,800 13,511,900
Interest rate 4.455%    
Accrued interest   18,200 23,400
Notes payable and accrued interest   11,403,000 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   137,500,000 134,000,000
Unamortized debt issuance costs   (1,483,500) (2,216,000)
Credit facility current borrowing capacity   $ 170,000,000  
Date of expiration   May 31, 2019  
Credit facility maximum borrowing capacity   $ 180,000,000  
Unused amount of the credit facility   $ 32,500,000 $ 36,000,000
Weighted average interest rate on credit facility   5.51% 5.21%
Special purpose financing [Abstract]      
Accrued interest   $ 223,000 $ 278,900