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Notes Payable and Accrued Interest, UK LLC SPE Financing (Details) - UK LLC SPE Financing [Member]
Aug. 31, 2016
USD ($)
Aircraft
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
UK LLC SPE Financing [Abstract]      
Note obligation   $ 9,211,200 $ 13,511,900
Principal and interest due   $ 9,227,200 $ 13,535,300
Regional Jet Aircraft [Member]      
UK LLC SPE Financing [Abstract]      
Number of aircraft purchased | Aircraft 2    
October 3, 2020 [Member]      
UK LLC SPE Financing [Abstract]      
Note obligation $ 9,805,600    
Interest rate per annum 4.455%    
November 7, 2020 [Member]      
UK LLC SPE Financing [Abstract]      
Note obligation $ 9,804,300    
Interest rate per annum 4.455%