Related party transactions and balances - Accounts Payables (Details) - Related Party - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Accounts payable	$ 49,855	$ 894,661
Foremost Worldwide Co., Ltd.
Related Party Transaction [Line Items]
Accounts payable	0	718,605
Rizhao Foremost Woodwork Manufacturing Co., Ltd.
Related Party Transaction [Line Items]
Accounts payable	49,855	56,389
F.P.Z. Furniture (Cambodia) Co., Ltd.
Related Party Transaction [Line Items]
Accounts payable	$ 0	$ 119,667