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v3.26.1

Summary of significant accounting policies - Shipping and Handling Costs (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Accounting Policies [Abstract] |  |
Shipping and handling expense | $ 375,673 | $ 356,154

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- Definition Selling, General and Administrative Expense, Shipping and Handling Costs + References No definition available. + Details
Name: | fgi_SellingGeneralAndAdministrativeExpenseShippingAndHandlingCosts
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_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration