v3.26.1
Summary of Significant Accounting Policies - Property and Equipment, Derivative Financial Instruments, Contract balances, Income taxes, Warranty Reserve and Self-insurance reserves (Details) - USD ($)
 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Derivative Financial Instruments        
Variable rate term loans $ 54,500,000   $ 24,375,000  
Contract Balances        
Balance at beginning of the period (Contract Assets) 5,320,353 $ 1,680,060    
Balance at beginning of the period (Contract Liabilities) 2,481,929 340,481    
Amount transferred to receivables from contract assets (5,039,611) (1,285,317)    
Contract asset additions 1,454,524 740,928    
Performance obligations satisfied during the period that were included in the contract liabilities balance at the beginning of the period (2,237,295) (280,322)    
Increases due to invoicing prior to satisfaction of performance obligations 1,127,275 (2,469,374)    
Balance at end of the period (Contract Assets) 1,735,266 1,135,671    
Balance at end of the period (Contract Liabilities) 1,371,909 2,529,533    
Accounts receivable $ 15,984,217 $ 11,536,254 12,956,476 $ 12,612,482
Warranty Reserve        
Standard warranty period 24 months      
Self-Insurance Reserves        
Estimated liability for medical claims incurred but not reported $ 103,000   $ 153,000  
Excess of funded premiums over estimated claims incurred but not reported 103,000      
Interest Rate Swap        
Derivative Financial Instruments        
Interest rate swap agreement 53,700,000      
Variable rate term loans $ 53,700,000      
Fixed interest rate 4.057%      
Buildings and improvements | Minimum        
Property and Equipment        
Estimated useful lives 10 years      
Buildings and improvements | Maximum        
Property and Equipment        
Estimated useful lives 39 years      
Furniture and office equipment | Minimum        
Property and Equipment        
Estimated useful lives 5 years      
Furniture and office equipment | Maximum        
Property and Equipment        
Estimated useful lives 7 years      
Computer equipment        
Property and Equipment        
Estimated useful lives 5 years      
Corporate R&D airplane        
Property and Equipment        
Estimated useful lives 12 years      
Equipment | Minimum        
Property and Equipment        
Estimated useful lives 1 year      
Equipment | Maximum        
Property and Equipment        
Estimated useful lives 19 years