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Note 13 - Revenue from Contracts with Customers - Changes in Deferred Service Fees (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2023 USD ($)
Balance | $ 82,713
Balance | 82,314
Service Fees [Member] |
Balance | 82,713
Deferral of revenue | 43,891
Recognition of deferred service fees | (44,290)
Balance | $ 82,314

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: |