Related party transactions and balances - Purchases of a related party (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Purchases from a related parties	$ 12,236,955	$ 14,999,058
Focal Capital Holding Limited
Related Party Transaction [Line Items]
Purchases from a related parties	5,861,323	6,157,455
Foremost Worldwide Co., Ltd.
Related Party Transaction [Line Items]
Purchases from a related parties	5,995,537	8,385,673
Rizhao Foremost Woodwork Manufacturing Co., Ltd.
Related Party Transaction [Line Items]
Purchases from a related parties	364,719	330,722
F.P.Z. Furniture (Cambodia) Co., Ltd.
Related Party Transaction [Line Items]
Purchases from a related parties	$ 15,376	$ 125,208