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Summary of Significant Accounting Policies - Shipping and Handling Costs (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Selling, General and Administrative Expense [Abstract] |  |  |  |
Shipping and handling expense | $ 253,742 | $ 210,370 | $ 500,851 | $ 314,084

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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