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Note 14 - Revenue From Contracts With Customers - Deferred Contract Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Balance, net | $ 13,734 | $ 13,257
Additions | 9,619 | 9,405
Amortization | (9,464) | (8,928)
Balance, net | 13,889 | 13,734
Cost to Obtain Contract [Member] |  |
Balance, net | 13,653 | 13,174
Additions | 9,595 | 9,381
Amortization | (9,440) | (8,902)
Balance, net | 13,808 | 13,653
Cost to Fulfill Contract [Member] |  |
Balance, net | 81 | 83
Additions | 24 | 24
Amortization | (24) | (26)
Balance, net | $ 81 | $ 81

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- Definition Amount of addition to capitalized contract cost. + References No definition available. + Details
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Namespace Prefix: | kfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of amortization expense 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

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of 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 (a) -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: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |