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Contract assets/(liabilities) (Details) - USD ($) | Mar. 31, 2025 | Sep. 30, 2024
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Contract assets: |  |
Retainage receivables | $ 1,746,874 | $ 1,727,841
Revenue recognized in excess of amounts billed | 4,019,808 | 2,560,872
Total contract assets | 5,766,682 | 4,288,713
Less: allowance for credit losses | (67,237) | (17,414)
Total contract assets, net | 5,699,445 | 4,271,299
Contract assets, current | 4,686,136 | 3,270,627
Contract assets, non-current | 1,013,309 | 1,000,672
Contract liabilities: |  |
Payment received from customers in excess of revenue recognized | $ (76,674) | $ (512,171)

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