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

X

- 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

X

- Details

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