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Summary of Significant Accounting Policies - Non-controlling Interests (Details)	Dec. 31, 2023
Isla Porter LLC [Member]
Noncontrolling Interest [Line Items]
Percentage of non-controlling interests	40.00%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_OwnershipAxis=fgi_IslaPorterLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: