SHORT-TERM AND LONG-TERM DEBT - Summary of short-term and long-term debt (Details) - USD ($)	Jun. 30, 2026	Sep. 30, 2025
SHORT-TERM AND LONG-TERM DEBT
Total debt	$ 45,331,357	$ 72,204,213
Less current maturities	19,505,638	21,948,182
Total long-term debt	25,825,719	50,256,031
Line of credit payable to bank, final payment due by June 28, 2028
SHORT-TERM AND LONG-TERM DEBT
Total debt	12,250,000	24,750,000
Equipment line of credit, Final payment due February 2028
SHORT-TERM AND LONG-TERM DEBT
Total debt	4,337,945	5,878,041
Paycheck Protection Program loans from Small Business Administration
SHORT-TERM AND LONG-TERM DEBT
Total debt	10,475,870	10,401,366
Term note payable to United Bank, WV Pipeline acquisition, final payment due by March 25, 2026
SHORT-TERM AND LONG-TERM DEBT
Total debt		390,328
Notes Payable To Finance Companies Due July 2026 through February 2030
SHORT-TERM AND LONG-TERM DEBT
Total debt	5,505,815	5,415,401
Note payable to United Bank Tribute acquisition finance final payment due by December 2030
SHORT-TERM AND LONG-TERM DEBT
Total debt	7,560,657	14,164,413
Notes payable to bank, final payment due November 2034
SHORT-TERM AND LONG-TERM DEBT
Total debt	668,343	710,466
Notes payable to bank, final payment due by October 2027
SHORT-TERM AND LONG-TERM DEBT
Total debt		1,411,890
Convertible equipment line of credit
SHORT-TERM AND LONG-TERM DEBT
Total debt	4,065,877	4,910,097
Unsecured notes payable to Joe and Cathy Rigney, due September 30, 2030
SHORT-TERM AND LONG-TERM DEBT
Total debt	$ 466,850	461,000
Notes payable to David Bolton and Daniel Bolton due final payment December 31, 2025
SHORT-TERM AND LONG-TERM DEBT
Total debt		500,000
Note payable to United Bank, Tri-State Paving acquisition, final payment due by June 1, 2027
SHORT-TERM AND LONG-TERM DEBT
Total debt		2,961,211
Notes payable to Corns Enterprises, final payment due April 29, 2026
SHORT-TERM AND LONG-TERM DEBT
Total debt		$ 250,000