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Note 13 - Revenue from Contracts with Customers (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Increase (Decrease) in Deferred Contract Costs				$ 635	$ 2,135
Percentage of Deferred Service Fees				47.30%
Capitalized Contract Cost, Impairment Loss	$ 0	$ 0		$ 0	0
Service Fees [Member]
Receivables from Customers	9,426			9,426		$ 10,304
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 100	$ 0		200	0
Contract with Customer, Liability, Revenue Recognized				$ 32,900	$ 32,600
Deferred Revenues and Deferred Contract Costs Associated With Vehicle Service Agreement Fees [Member | IWS [Member]
Deferred Revenue and Deferred Contract Costs, Net Charge			$ 900
Deferred Service Fees, Increase (Decrease) During Period			1,100
Increase (Decrease) in Deferred Contract Costs			$ 200
Minimum [Member]
Customer Refunds Percentage				9.00%
Maximum [Member]
Customer Refunds Percentage				13.00%

X

- Definition

Represents percentage of customer refunds.

+ References

No definition available.

+ Details

Name:	kfs_CustomerRefundsPercentage
Namespace Prefix:	kfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents net charge deferred revenue and deferred contract costs

+ References

No definition available.

+ Details

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

X

- Definition

Represents deferred service fees increase (decrease) during period.

+ References

No definition available.

+ Details

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

X

- Definition

The increase (decrease) during the reporting period in the balance sheet value of deferred contract costs.

+ 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 percentage of deferred service fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	kfs_
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Balance Type:	na
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X

- Definition

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-8

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 310
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//940-310/tableOfContent

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- Details

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- Details

Name:	srt_RangeAxis=srt_MinimumMember
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- Details

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