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Note 6 - Investments - Gross Realized Gains and Losses on Available-for-sale Investments, Limited Liability Investment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net realized gains	$ 277	$ 123	$ 401	$ 333
Fixed Maturities [Member]
Gross realized gains	0	0	0	2
Gross realized losses	0	0	0	0
Realized gains (losses)	0	0	0	2
Limited Liability Investments [Member]
Realized gains (losses)	0	5	0	103
Limited Liability Investments, Fair Value [Member]
Realized gains (losses)	271	106	386	216
Private Company Investments [Member]
Realized gains (losses)	$ 6	$ 12	$ 15	$ 12

X

- Definition

Represents realized investment gains.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of realized investment gains and (losses).

+ References

No definition available.

+ Details

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

X

- Definition

Represents realized investment losses.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of realized gain (loss) on investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

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- Details

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X

- Details

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X

- Details

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