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Customer Rewards Liability - Company's Customer Rewards Liability (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Customer Advances or Deposits, Noncurrent [Abstract] |  |  |  |
Beginning balance |  | $ 6,371,951 | $ 8,569,651 | $ 5,333,384
Rewards earned by customers |  | 699,236 | 2,029,331 | 1,469,239
Reward fulfilments | [1] | (1,319,625) | (2,577,906) | (2,628,920)
Expired rewards |  | (57,583) | (202,933) | (145,855)
Remeasurement (gain) loss on customer rewards liability |  | 2,875,672 | 1,477,444 | 2,344,103
Ending balance |  | $ 8,569,651 | $ 9,295,587 | $ 6,371,951
[1] | Rewards fulfilments represent amounts that were distributed to customers to fulfill customer rewards obligations.

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- Definition Expired rewards. + References No definition available. + Details
Name: | fld_ExpiredRewards
Namespace Prefix: | fld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Remeasurement gain loss on customer rewards liability. + References No definition available. + Details
Name: | fld_RemeasurementGainLossOnCustomerRewardsLiability
Namespace Prefix: | fld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Rewards earned by customers. + References No definition available. + Details
Name: | fld_RewardsEarnedByCustomers
Namespace Prefix: | fld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Rewards fulfilments. + References No definition available. + Details
Name: | fld_RewardsFulfilments
Namespace Prefix: | fld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-27 + Details
Name: | us-gaap_ContractWithCustomerRefundLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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