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Note 13 - Revenue from Contracts with Customers - Changes in Deferred Service Fees (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Balance, December 31, 2022	$ 82,713
Balance, March 31, 2023	82,367
Service Fees [Member]
Balance, December 31, 2022	82,713
Deferral of revenue	14,770
Recognition of deferred service fees	(15,116)
Balance, March 31, 2023	$ 82,367

X

- Definition

Amount of deferral of revenue for contract with customer liability.

+ References

No definition available.

+ Details

Name:	kfs_ContractWithCustomerLiabilityDeferralOfRevenue
Namespace Prefix:	kfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of recognition of deferred revenue for contract with customer, liability

+ References

No definition available.

+ Details

Name:	kfs_ContractWithCustomerLiabilityRecognitionOfDeferredRevenue
Namespace Prefix:	kfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-2

+ Details

Name:	us-gaap_ContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_ProductOrServiceAxis=kfs_ServiceFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: