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Accounts Receivable, Net - Accrued Defective Return and Discount Accounts Roll Forward (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Receivables [Abstract] |  |  |
Beginning balance | $ 744,284 | $ 1,595,838 | $ 1,595,838
Provision (recovery) | 554,148 | $ (316,132) | (851,554)
Ending balance | $ 1,298,432 |  | $ 744,284

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