CONTRACT BALANCES - Accounts receivable-trade, net of allowance for doubtful accounts (Details) - USD ($)	9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2025
CONTRACT BALANCES
Decrease in Accounts receivable-trade, net of allowance for credit losses	$ 64,607,349		$ 76,048,448
Decrease in contracts receivable	(11,441,099)	$ (4,000,870)
Contract assets
Cost and estimated earnings in excess of billings	43,901,138		34,455,011
Increase in cost and estimated earnings in excess of billings	9,446,127	373,797
Contract liabilities
Billings in excess of cost and estimated earnings	27,166,506		$ 28,318,765
Decrease in billings in excess of cost and estimated earnings	$ (1,152,259)	$ 10,028,162