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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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gross realized gains	$ 7	$ 0	$ 9	$ 1
Gross realized losses	(7)	(2)	(7)	(23)
Net	$ 0	$ (2)	$ 2	$ (22)

X

- Definition

Represents realized investment gains.

+ References

No definition available.

+ Details

Name:	kfs_RealizedInvestmentGains
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

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

X

- Definition

Represents realized investment losses.

+ References

No definition available.

+ Details

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