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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Gross realized gains | $ 0 | $ 0 | $ 2 | $ 1
Gross realized losses | 0 | (16) | 0 | (21)
Net | $ 0 | $ (16) | $ 2 | $ (20)

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