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Accounts Receivable, Net - Accrued Defective Return and Discount Accounts Roll Forward (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Receivables [Abstract] |  |
Beginning balance | $ 1,595,838 | $ 3,292,101
Provision | (851,554) | (1,696,263)
Ending balance | $ 744,284 | $ 1,595,838

X
- Definition The amount as of the balance sheet date of accrued defective return and discount on accounts receivables, classified as current. + References No definition available. + Details
Name: | fgi_AccountsReceivableAccruedDefectiveReturnAndDiscountCurrent
Namespace Prefix: | fgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of provision for accrued defective return and discount on accounts receivables, classified as current. + References No definition available. + Details
Name: | fgi_ProvisionForAccruedDefectiveReturnAndDiscountOnAccountsReceivableCurrent
Namespace Prefix: | fgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration