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SHORT-TERM AND LONG-TERM DEBT - Summary of short-term and long-term debt (Details) (Parenthetical) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2021
SHORT-TERM AND LONG-TERM DEBT      
Line of credit $ 27,657,997 $ 25,089,446  
Fair value of debt $ 42,800,000 24,700,000  
Line of credit payable to bank, final payment due by June 28, 2027      
SHORT-TERM AND LONG-TERM DEBT      
Interest rate 7.25%    
Equipment line of credit, Final payment due February 2028      
SHORT-TERM AND LONG-TERM DEBT      
Borrowed on line of credit $ 9,300,000    
Note payable in monthly or annual installments $ 202,809    
Interest rate 7.25%    
Paycheck Protection Program loans from Small Business Administration      
SHORT-TERM AND LONG-TERM DEBT      
Interest rate     1.00%
Term note payable to United Bank, WV Pipeline acquisition, final payment due by March 25, 2026      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 64,853    
Interest rate 4.25%    
Notes payable to finance companies due October 2025 through September 2028      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 244,000 $ 76,000  
Notes payable to finance companies due October 2025 through September 2028 | Minimum      
SHORT-TERM AND LONG-TERM DEBT      
Interest rate 0.00%    
Notes payable to finance companies due October 2025 through September 2028 | Maximum      
SHORT-TERM AND LONG-TERM DEBT      
Interest rate 6.00%    
Note payable to United Bank Tribute acquisition finance final payment due by December 2030      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 272,016    
Interest rate 6.90%    
Notes payable to bank, final payment due November 2034      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 7,848    
Interest rate 4.82%    
Notes payable to bank, final payment due November 2025      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 59,932    
Interest rate 6.00%    
Convertible equipment line of credit      
SHORT-TERM AND LONG-TERM DEBT      
Line of credit $ 5,000,000    
Interest rate 8.50%    
Interest rate on line of credit 2.75%    
Unsecured notes payable to Joe and Cathy Rigney, due September 30, 2030      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 500,000    
Interest rate 5.00%    
Fair value of debt $ 461,000    
Unsecured notes payable 5 years    
Notes payable to David Bolton and Daniel Bolton due final payment December 31, 2025      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 500,000    
Interest rate 3.25%    
Note payable to United Bank, Tri-State Paving acquisition, final payment due by June 1, 2027      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 129,910    
Interest rate 4.50%    
Notes payable to Corns Enterprises, final payment due April 29, 2026      
SHORT-TERM AND LONG-TERM DEBT      
Note payable in monthly or annual installments $ 1,000,000    
Interest rate 3.50%    
Fair value of debt $ 936,000    
Notes payable on annual installments $ 250,000