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v3.25.3

Note 17 - Redeemable Noncontrolling Interest (Details Textual) | Aug. 14, 2025
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Southside Plumbing [Member] |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 20.00%

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_OwnershipAxis=kfs_SouthsidePlumbingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |