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Contract assets (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]    
Revenue recognized $ 97,333,105 $ 71,023,301
Less: progress billings (57,343,747) (31,857,462)
Contract assets 39,989,358 39,165,839
Contract assets, current 31,438,860 34,280,084
Contract assets, non-current $ 8,550,498 $ 4,885,755