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Summary of Significant Accounting Policies (Details)
 3 Months Ended
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Number of business segments        
Number of business segments in which the entity operates | segment 1      
Long-Lived Assets        
Impairment charges $ 0 $ 0    
Contract Balances        
Balance at beginning of the period (contract liabilities) 417,504      
Amount transferred to receivables from contract assets 0      
Contract asset additions 0      
Performance obligations satisfied during the period that were included in the contract liability balance at the beginning of the period (117,986)      
Increases due to invoicing prior to satisfaction of performance obligations 36,336      
Balance at end of the period (contract liabilities) 335,854      
Customer Service Revenue        
Customer Service Cost of Sales 2,728,057 2,303,829    
Gross profit $ 3,967,721 2,565,823    
Engineering Development        
Percentage of employees who were engineers engaged in various engineering development projects 18.00%      
Warranty        
Length of warranty period 24 months      
Self-Insurance Reserves        
Estimated liability for medical claims incurred but not reported $ 56,580     $ 55,934
Excess of funded premiums over estimated claims incurred but not reported 162,706     208,651
Restricted Cash        
Dividends paid   8,607,192    
Cash and cash equivalents 9,705,993   $ 8,265,606  
Total cash and cash equivalents and restricted cash 9,705,993 5,608,255 $ 8,265,606 $ 23,784,867
Customer Service        
Customer Service Revenue        
Customer Service Sales 1,085,445 815,503    
Customer Service Cost of Sales 343,650 316,637    
Gross profit $ 741,795 $ 498,866    
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Minimum        
Number of business segments        
Estimated useful lives 3 years      
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Maximum        
Number of business segments        
Estimated useful lives 7 years      
Manufacturing facility        
Number of business segments        
Estimated useful lives 39 years      
Corporate airplanes        
Number of business segments        
Estimated useful lives 10 years