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Property and Equipment (Details)
12 Months Ended
Sep. 30, 2018
USD ($)
aircraft
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Property and equipment      
Property and equipment, gross $ 21,238,428 $ 18,756,406  
Less: accumulated depreciation and amortization (12,451,691) (12,087,395)  
Property and equipment, net 8,786,737 6,669,011  
Depreciation $ 400,000 400,000 $ 500,000
Number of corporate airplanes, depreciated | aircraft 2    
Computer equipment      
Property and equipment      
Property and equipment, gross $ 2,268,969 2,247,866  
Corporate airplanes      
Property and equipment      
Property and equipment, gross 5,601,039 3,194,571  
Furniture and office equipment      
Property and equipment      
Property and equipment, gross 1,033,779 1,051,637  
Manufacturing facility      
Property and equipment      
Property and equipment, gross 5,733,313 5,733,313  
Equipment      
Property and equipment      
Property and equipment, gross 5,580,083 5,507,774  
Land      
Property and equipment      
Property and equipment, gross $ 1,021,245 $ 1,021,245