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Schedule of contract assets and liabilities (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Contract Assets And Liabilities      
Contract assets $ 33,695,994 $ 32,832,290 $ 35,312,068
Contract liabilities $ 1,992,910 $ 2,430,663 $ 5,937,629