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Note 13 - Revenue from Contracts with Customers - Deferred Contract Costs (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Balance, net | $ 13,257 | $ 10,930
Additions | 2,343 | 2,359
Amortization | (2,116) | (1,334)
Balance, net | 13,484 | 11,955
Cost to Obtain Contract [Member] |  |
Balance, net | 13,174 | 10,850
Additions | 2,336 | 2,353
Amortization | (2,109) | (1,328)
Balance, net | 13,401 | 11,875
Cost to Fulfill Contract [Member] |  |
Balance, net | 83 | 80
Additions | 7 | 6
Amortization | (7) | (6)
Balance, net | $ 83 | $ 80

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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

X
- 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: |