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Changes in operating assets and liabilities, adjusted for assets and liabilities disposed of (2026) and acquired (2025): Reconciliation of cash and cash equivalents and restricted cash to the consolidated balance sheets: Restricted cash Restricted Cash Advanced Plumbing Note [Member] Represents Advanced Plumbing note. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net (decrease) increase in cash and cash equivalents and restricted cash us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue Liabilities, balance Liabilities, balance us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Cash and cash equivalents and restricted cash per statements of cash flows kfs_PaymentsForProceedsFromLimitedLiabilityInvestmentsAtFairValue Net proceeds from limited liability investment, at fair value Represents payments for (proceeds from) limited liability investments at fair value. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents and restricted cash at beginning of period Cash and cash equivalents and restricted cash at end of period US Government Agencies Debt Securities [Member] KSX Notes Payable [Member] Represents KSX notes payable. Extended Warranty Revolver [Member] Represents extended warranty revolver. KSX Equipment Loans [Member] Represents KSX equipment loans. KSX Vehicle Loans [Member] Represents KSX vehicle loans. KSX Bank Term Loans [Member] Represents KSX Bank Term Loans. kfs_IncreaseDecreaseInServiceFeeReceivablesNetAdjustedForAssetsAcquired Service fee receivable, net Represents net adjusted for assets acquired for increase (decrease) in service fee receivables. Extended Warranty Term Loan and DDTL [Member] Represents extended warranty term loan and DDTL. KSX Revolver [Member] Represents KSX Revolver. us-gaap_OperatingLeasePayments Operating Lease, Payments PWI Holdings [Member] Represents PWI Holdings. 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Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Common stock, $0.01 par value; 50,000,000 authorized; 29,621,439 and 29,651,671 issued at June 30, 2026 and December 31, 2025, respectively; and 28,595,512 and 28,625,744 outstanding at June 30, 2026 and December 31, 2025, respectively DDI Loan [Member] Relating to DDI Loan. Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Limited Liability Investments, Fair Value [Member] Relating to Limited Liability Investments at fair value. us-gaap_PolicyTextBlockAbstract Accounting Policies SNS and DDI [Member] Relating to SNS and DDI. Healthcare Segment [Member] Relating to the healthcare segment. us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Software License and Support Fees [Member] Relating to software license and support fees. Comprehensive Income (Loss) Note [Text Block] Computer Equipment [Member] us-gaap_ComprehensiveIncomeNetOfTax Comprehensive loss attributable to common shareholders Finance lease liability, noncurrent kfs_BusinessCombinationConsiderationTransferredBeforeAdjustments Business Combination, Consideration Transferred, Before Adjustments Amount of consideration transferred, before adjustments, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Finance lease liability, current us-gaap_ShortTermInvestments Short-term investments, at cost which approximates fair value Significant Accounting Policies [Text Block] Earnings of noncontrolling interests Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes. Imputed interest Operating lease liabilities, noncurrent Total lease liabilities Operating lease liabilities, current Thereafter Equity Method Investments [Member] State and Provincial Regulatory Authorities [Member] Information pertaining to state and provincial regulatory authorities. Redeemable noncontrolling interests in consolidated subsidiaries Net loss attributable to redeemable noncontrolling interest Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] 2027 Business Combination, Contingent Consideration, Type [Domain] 2029 IWS [Member] Information pertaining to IWS Third Parties [Member] Information pertaining to third parties. 2028 Business Combination, Contingent Consideration, Type [Axis] Advanced Plumbing and Drain [Member] Related to Advanced Plumbing and Drain. 2026 Long-Term Debt, Maturity, Year One Increase (decrease) in fair value of subordinated debt Amount of increase (decrease) in the fair value of debt. Private Company Investments [Member] Information pertaining to private company investments. 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Statement of Cash Flows [Abstract] Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member] kfs_PreferredStockDividendRatePercentageIfNotPaidInTwoQuarters Preferred Stock, Dividend Rate, Percentage if Not Paid in Two Quarters The percentage rate used to calculate dividend payments on preferred stock if accrued and not paid for two quarters. Equity Components [Axis] Equity Component [Domain] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Equity [Text Block] AOCI Attributable to Parent [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Corporate Debt Securities [Member] Asset Acquisition [Domain] Asset Acquisition [Axis] Subordinated Debt [Member] Subordinated Borrowing [Table] Machinery and Equipment [Member] Intangible Asset and Goodwill [Text Block] Share-Based Payment Arrangement, Option, Activity [Table Text Block] us-gaap_NotesReduction Notes receivable related to disposal of subsidiary Share-Based Payment Arrangement, Option [Member] Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Current liabilities: Net realized gains Net realized gains us-gaap_LiabilitiesCurrent Total current liabilities Intangible assets, gross kfs_IndefinitelivedExcludingGoodwillAccumulatedImpairment Indefinite-Lived, accumulated impairment Accumulated amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. kfs_FinitelivedIntangibleAssetsAccumulatedImpairment Finite-Lived, accumulated impairment Accumulated amount of impairment of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. kfs_IntangibleAssetsExcludingGoodwillAccumulatedAmortization Total accumulated impairment Accumulated amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. Long-Term Debt, Fair Value KWH Bank Loan [Member] Represents information related to KWH bank loan. Increase (decrease) in fair value included in other comprehensive (loss) income (a) Unrealized (losses) gains arising during the period Lease, Cost [Table Text Block] Customer Relationships [Member] Leases of Lessee and Lessor Disclosure [Text Block] The entire disclosure for both lessee entity's leasing arrangements and lessor entity's leasing arrangements for operating, capital and leveraged leases.. 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Noncontrolling interests in consolidated subsidiaries kfs_DebtInstrumentLIBORFloor Debt Instrument, LIBOR Floor Minimum LIBOR interest rate for debt instrument. us-gaap_CustomerRefundLiabilityCurrent Refund liability kfs_DeferredTaxLiabilitiesLandAndIndefiniteLivedIntangibleAssets Deferred Tax Liabilities, Land and Indefinite Lived Intangible Assets Amount of deferred tax liability attributable to taxable temporary differences from land and indefinite lived intangible assets. Noncontrolling Interest Disclosure [Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Extended Warranty Segment [Member] Represents information related to extended warranty segment. Common stock issued at $11.75 per share, net us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders Distributions to noncontrolling interest holders us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners Subsidiary, Ownership Percentage, Noncontrolling Owner Carrying value Long-Term Debt, Gross us-gaap_DebtInstrumentFairValue Debt Instrument, Fair Value Disclosure Warranty Product Commissions [Member] Represents information related to warranty product commission. us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Vehicle Service Agreement Fees [Member] Represents information related to vehicle service agreement fees. Trinity [Member] Represents information related to trinity. us-gaap_AssetsCurrent Total current assets Maintenance Support Service Fees [Member] Represents information related to maintenance support service fees. 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Notes Payable to Banks [Member] Basic (in shares) Gain on change in fair value of limited liability investment, at fair value us-gaap_DebtInstrumentTerm Debt Instrument, Term (Year) Other Current Liabilities [Table Text Block] Limited Liability Investments [Member] Represents information related to limited liability investments. Notes Payable, Other Payables [Member] Notes payable issued for acquisitions of assets and business, net of discount Title and Position [Domain] Depreciation and amortization expense Document Fiscal Period Focus Document Fiscal Year Focus Amendment Flag Common Stock [Member] Document Period End Date Service Fees [Member] Represents information related to service fees. Property, Plant, and Equipment [Text Block] Long-Lived Asset, Class [Domain] Legal Entity [Axis] Granted, options (in shares) kfs_RealizedInvestmentGains Gross realized gains Represents realized investment gains. us-gaap_FinancialLiabilitiesFairValueDisclosure Total liabilities Redeemable Class C Preferred Stock [Member] Relating to redeemable class C preferred stock. Entity File Number Entity Tax Identification Number Non-cash financing activities: kfs_RealizedInvestmentLosses Gross realized losses Represents realized investment losses. Less than 12 Months Entity [Domain] kfs_CustomerRefundsPercentage Customer Refunds Percentage Represents percentage of customer refunds. Greater than 12 Months Entity Central Index Key Entity Registrant Name Entity Current Reporting Status KPH RUA [Member] Relating to the KPH RUA. 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Counterparty Name [Domain] Southside Plumbing [Member] Relating to Southside Plumbing. Seller Phantom Equity Award [Member] Relating to seller phantom equity award. Greater than 12 months, estimated fair value Less than 12 months, estimated fair value Award Type [Axis] Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Roundhouse Segment [Member] Relating to the Roundhouse segment. Plan Name [Axis] Plan Name [Domain] Motor Sales and Repair Service Fees [Member] Relating to motor sales and repair service fees. us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense Consolidation Items [Axis] Longhorns LLC [Member] Relating to Longhorns LLC. 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Accounting Standards Update and Change in Accounting Principle [Text Block] SNS Loan [Member] Represents the SNS loan. kfs_ContractWithCustomerAssetAdjustmentOfBalance Adjustment of contract asset balances The adjustment of balance for a contract with customer classified as an asset. kfs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedInNetLoss Change in fair value of limited liability investment, at fair value included in net income (loss) The unrealized gain loss included in net loss for a fair value measurement with unobservable inputs asset reconciliation on a recurring basis. Principal Total The principal carrying amount for debt instruments. Amended Ravix Bank Loan [Member] Relataed to amended Ravix Bank Loan. Nursing Service LLC [Member] Related to Nursing Service LLC. Income Statement [Abstract] The SNS Loan [Member] Related to the SNS loan. us-gaap_NumberOfReportableSegments Number of Reportable Segments kfs_RealizedInvestmentGainsAndLosses Net realized losses on available-for-sale fixed maturities The amount of realized investment gains and (losses). us-gaap_TreasuryStockCommonValue Treasury stock, at cost; 1,025,927 outstanding at June 30, 2026 and December 31, 2025 kfs_LeaseLiabilityCurrent Current lease liability Represents the amount of lease liabilities classified as current. Treasury stock (in shares) Income Tax Contingency [Table] kfs_ReceivableMeasurementInput Receivable, Measurement Input Represents the the input of measurement for receivables. Treasury Stock, Common [Member] us-gaap_AmortizationOfIntangibleAssets Intangible Asset, Finite-Lived, Amortization Expense Convertible Debt Securities [Member] Income Tax Disclosure [Text Block] Restricted Stock [Member] Asset-Backed Securities [Member] Income tax expense (benefit) at U. 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Intangible assets, net of accumulated amortization of $37,788 and $34,013, respectively Intangible assets, net us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit Goodwill disposed of related to Trinity Acquisition Goodwill, Acquired During Period us-gaap_FiniteLivedIntangibleAssetsNet Intangible Asset, Finite-Lived, after Accumulated Amortization Intangible assets subject to amortization Intangible Asset, Finite-Lived, before Accumulated Amortization Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Intangible assets not subject to amortization Intangible Asset, Excluding Goodwill, Indefinite-Lived Goodwill Excess purchase price allocated to goodwill Balance Balance Investment [Table Text Block] Variable lease cost Operating lease cost Short-term lease cost Business Combination [Domain] Business Combination [Axis] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired Business Acquisition, Percentage of Voting Interests Acquired Contract asset additions Amount of increase of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. Business Combination [Table] Ravix Bank Loan 2025 [Member] Represents 2025 Ravix term Loan. 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Inc. kfs_ProceedsFromIssuanceOfCommonStockGross Proceeds From Issuance of Common Stock, Gross Represents the cash inflow from issuance of common stock before issuance costs. Ravix Bank Loan [Member] Represents Ravix bank loan. Property, Plant, and Equipment [Table] Ravix [Member] Represents Ravix. Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) Consulting Fees [Member] represents consulting fees. Business Services Consulting [Member] Represents business services consulting. us-gaap_NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted Numerator used in calculating diluted loss per share attributable to common shareholders us-gaap_NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic Net loss attributable to common shareholders Restricted Common Unit Awards [Member] Represents restricted common unit awards. us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements Settlements, liability Long-Lived Asset, Class [Axis] Kingsway Search Xcelerator [Member] Represents kingsway search xcelerator. Cash and cash equivalents kfs_CashFeeForEachYearOfService Cash Fee for Each Year of Service The value of cash fee for each year of service. Cash divested Contingent Consideration Liability [Member] Represents information related to contingent consideration liability. 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