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Property and equipment, net (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 3,132,396 $ 4,156,025
Less: accumulated depreciation (1,841,074) (2,460,677)
Property and equipment, net 1,291,322 1,695,348
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,118,469 1,135,160
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,474,577 2,103,979
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 52,400 65,765
Automobiles [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 486,950 $ 851,121