Summary of significant accounting policies - Earnings Per Share - Tabular Disclosure (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net (loss) income attributable to FGI Industries Ltd. shareholders - basic	$ (1,201,089)	$ 733,604
Net (loss) income attributable to FGI Industries Ltd. shareholders - diluted	$ (1,201,089)	$ 733,604
Denominator:
Weighted-average number of ordinary shares outstanding - basic (in shares)	9,565,167	9,525,434
Potentially dilutive shares from outstanding options/warrants (in shares)	0	295,678
Weighted-average number of ordinary shares outstanding - diluted (in shares)	9,565,167	9,821,112
Earnings (loss) per share:
Earnings (loss) per share - basic (in dollars per share)	$ (0.13)	$ 0.08
Earnings (loss) per share - diluted (in dollars per share)	$ (0.13)	$ 0.07