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Cost of sales (Details) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cost of sales.      
Cost of transportation (B2B) $ 16,749,253 $ 10,654,177 $ 14,185,568
Cost of transportation for B2C 3,059,242 2,913,963 4,555,709
Cost of sales $ 19,808,495 $ 13,568,140 $ 18,741,277