Short-term loans (Details) $ in Millions		9 Months Ended
Short-term loans (Details) $ in Millions	Jan. 25, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 CAD ($)	Jan. 14, 2025 USD ($)	Dec. 31, 2024 USD ($)
Short-Term Debt [Line Items]
Short-term loans		$ 14,076,346			$ 14,502,367
CTBC Bank Co, Ltd Omnibus Credit Line
Short-Term Debt [Line Items]
Short-term loans				$ 3,000,000.0
Line of Credit \| Non-discretionary Line of Credit
Short-Term Debt [Line Items]
Maximum borrowing capacity		$ 18,000,000
Debt coverage ratio		1.25
Tangible net worth		$ 10,000,000
Tangible net worth ratio		4.0
Interest rate (as a percent)		7.00%	7.00%		7.25%
Short-term loans		$ 9,700,000			$ 9,600,000
Line of Credit \| Non-discretionary Line of Credit \| Minimum
Short-Term Debt [Line Items]
Interest rate (as a percent)		4.50%	4.50%
Line of Credit \| Non-discretionary Line of Credit \| Secured Overnight Financing Rate (SOFR)
Short-Term Debt [Line Items]
Basis spread (as a percent)		2.20%
Line of Credit \| Non-discretionary Line of Credit \| Prime Rate
Short-Term Debt [Line Items]
Basis spread (as a percent)		(0.25%)
Line of Credit \| Discretionary Line of Credit
Short-Term Debt [Line Items]
Maximum borrowing capacity		$ 5,400,000	$ 7.5
Tangible net worth ratio		3.00
Short-term loans		$ 1,800,000			2,600,000
Current ratio		1.25	1.25
Line of credit facility, expiration, notice period		60 days
Line of Credit \| Discretionary Line of Credit \| Prime Rate
Short-Term Debt [Line Items]
Basis spread (as a percent)		0.50%
Line of Credit \| Revolving Foreign Exchange Facility
Short-Term Debt [Line Items]
Maximum borrowing capacity		$ 3,000,000
Line of Credit \| CTBC Bank Co, Ltd Omnibus Credit Line
Short-Term Debt [Line Items]
Maximum borrowing capacity	$ 2,300,000
Basis spread (as a percent)	1.20%
Short-term loans		$ 2,600,000			$ 2,300,000
Borrowing limit, percentage of export "open account" trade receivables (as a percent)	90.00%
Mr. Liang Chou Chen \| Foremost Groups Ltd.
Short-Term Debt [Line Items]
Ownership percentage (as a percent)		49.91%	49.91%

FGI Industries Ltd. 10-Q