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Summary of Significant Accounting Policies - Shipping and Handling Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Selling, General and Administrative Expense [Abstract]
Shipping and handling expense	$ 711,640	$ 842,827

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- Definition

Selling, General and Administrative Expense, Shipping and Handling Costs

+ References

No definition available.

+ Details

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Namespace Prefix:	fgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_SellingGeneralAndAdministrativeExpenseAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration