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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.

X

- Definition

Expired rewards.

+ References

No definition available.

+ Details

Name:	fld_ExpiredRewards
Namespace Prefix:	fld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- 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

X

- Definition

Rewards fulfilments.

+ References

No definition available.

+ Details

Name:	fld_RewardsFulfilments
Namespace Prefix:	fld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_CustomerAdvancesOrDepositsNoncurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration