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CONTRACT BALANCES - Accounts receivable-trade, net of allowance for doubtful accounts (Details) - USD ($) | 12 Months Ended |
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Sep. 30, 2025 | Sep. 30, 2024
CONTRACT BALANCES |  |
Accounts receivable-trade, net of allowance for doubtful accounts | $ 76,048,448 | $ 56,064,318
Change in accounts receivable-trade, net of allowance for doubtful accounts | 19,984,130 |
Contract assets |  |
Cost and estimated earnings in excess of billings | 34,455,011 | 24,595,792
Change in cost and estimated earnings in excess of billings | 9,859,219 |
Contract liabilities |  |
Billings in excess of cost and estimated earnings | 28,318,765 | $ 16,950,988
Change in billings in excess of cost and estimated earnings | $ 11,367,777 |

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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References No definition available. + Details
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- Definition The amount related to increase (decrease) in contract with customer due to increase in costs and estimated earnings in excess of billings on uncompleted projects. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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