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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Aggregate principal amount of fixed-rate debt $ 43,800,000 $ 25,600,000
Fair value of aggregate principal amount of debt 42,800,000 24,700,000
Surety deposit balance 2,100,000 2,000,000
Advertising expense $ 294,000 $ 279,000
Buildings    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Estimated useful lives 39 years  
Minimum    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Billing and payment term 30 days  
Minimum | Operating equipment and vehicles    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Estimated useful lives 5 years  
Minimum | Office equipment, furniture and fixtures    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Estimated useful lives 5 years  
Maximum    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Billing and payment term 45 days  
Maximum | Operating equipment and vehicles    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Estimated useful lives 7 years  
Maximum | Office equipment, furniture and fixtures    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Estimated useful lives 7 years