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Note 23 - Fair Value of Financial Instruments (Details Textual) $ in Thousands	3 Months Ended	10 Months Ended	12 Months Ended		24 Months Ended
	Dec. 31, 2024 USD ($)	Oct. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2022
Payment for Contingent Consideration Liability, Financing Activities			$ 650	$ 375
Private Company Investments [Member]
Equity Method Investment, Other-than-Temporary Impairment			0	100
Ravix [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High		$ 4,500
Payment for Contingent Consideration Liability, Financing Activities	$ 700				$ 1,100
Business Combination, Contingent Consideration, Liability	$ 2,700		$ 2,700	3,100	3,100	$ 3,400
Business Combination, Contingent Consideration, Liability, Interest Rate	6.00%		6.00%
Ravix [Member] | Maximum [Member]
Business Combination, Contingent Consideration, Accrued Interest	$ 100		$ 100
CSuite Acquisition, LLC [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High			3,600
Business Combination, Contingent Consideration, Liability	$ 0		$ 0	$ 0	$ 0
Trust Preferred Debt Repurchase Options Contracts [Member]
Derivative, Number of Instruments Held, Total							3

X

- Definition

Amount of accrued interest liability recognized arising from contingent consideration in a business combination.

+ References

No definition available.

+ Details

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X

- Definition

Contractual interest rate for unpaid contingent consideration liability.

+ References

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+ Details

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Namespace Prefix:	kfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This element represents the amount of any change recognized during the period in the high-end of the estimated range of outcomes (undiscounted) of a liability assumed in a business combination arising from an item of contingent consideration.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(2)
-Publisher FASB
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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section 50
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X

- Definition

Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
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-Section 45
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X

- Definition

Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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X

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Balance Type:
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