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Note 10 - Derivatives (Details Textual) - USD ($) $ in Millions			6 Months Ended
	Sep. 26, 2022	Aug. 02, 2022	Jun. 30, 2024	Jun. 30, 2023	Mar. 02, 2023	Feb. 28, 2023	Sep. 20, 2022	Sep. 15, 2022	Apr. 01, 2021
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Interest Expense, Debt	Interest Expense, Debt
Derivative Asset, Statement of Financial Position [Extensible Enumeration]			Other Receivables	Other Receivables
Interest Rate Cap [Member] | CIBC Bank USA [Member]
Derivative, Fixed Interest Rate								1.103%	1.18%
Derivative, Notional Amount									$ 11.9
Trust Preferred Debt Repurchase August Options [Member]
Trust Preferred Debt Repurchase Options, Maximum Percent of Principal and Deferred Interest		100.00%
Purchase Price, Percentage of Outstanding Principal and Deferred Interset	63.75%	63.00%
Trust Preferred Debt Repurchase Options, Minimum Repurchase, Percentage		50.00%
Payments to Holders of Trust Preferred Debt Repurchase Option		$ 2.0
Trust Preferred Debt Repurchase Option, Threshold		30.0
Amount Forfeited if Repurchased Amount Less Than 30 Million or Failing to Purchase Principal or Deferred Interest Within One Year		$ 2.0
Trust Preferred Debt Repurchase September 20 Options [Member]
Trust Preferred Debt Repurchase Options, Maximum Percent of Principal and Deferred Interest							100.00%
Purchase Price, Percentage of Outstanding Principal and Deferred Interset							63.75%
Trust Preferred Debt Repurchase September 26 Options [Member]
Trust Preferred Debt Repurchase Options, Maximum Percent of Principal and Deferred Interest	100.00%				100.00%	100.00%
Purchase Price, Percentage of Outstanding Principal and Deferred Interset	63.00%
Payments to Holders of Trust Preferred Debt Repurchase Option	$ 0.3
Amount Forfeited if Failing to Purchase Principal or Deferred Interest	$ 0.3
Derivative, Gain (Loss) on Derivative, Net				$ 1.4
Payments for Derivative Instrument, Investing Activities			$ 56.5

X

- Definition

Represents amount of cash forfeited when the company fails to purchase any principal or deferred interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfs_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Represents amount of cash paid forfeited if the company repurchase amount less than 30.0 million or the company fails to purchase principal or deferred interest.

+ References

No definition available.

+ Details

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X

- Definition

The cash outflow to the holders of trust preferred debt repurchases options.

+ 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 purchase price as a percentage of outstanding principal and deferred interest.

+ References

No definition available.

+ Details

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

X

- Definition

Represents threshold amount that the company repurchased under trust preferred debt repurchase option.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents maximum percentage of principal and deferred interest allowed to repurchase.

+ References

No definition available.

+ Details

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X

- Definition

Represents amount of minimum repurchase amount as a percentage of amount held by holders under trust preferred debt repurchase options.

+ References

No definition available.

+ Details

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X

- Definition

Indicates line item in statement of financial position that includes derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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Period Type:	duration

X

- Definition

Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

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X

- Definition

The cash outflow for derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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- Details

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- Details

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X

- Details

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X

- Details

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