Document And Entity Information Note To Financial Statement Details Textual Significant Accounting Policies us-gaap_IncomeTaxExpenseBenefit Total income tax benefit (expense) Note 1 - Description of Business and Significant Accounting Policies ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 2 - Investments usac_LiabilityForFuturePolicyBenefitAfterReinsuranceAndOtherChanges Net liability for future policy benefits, after reinsurance recoverable Amount, after effect of reinsurance and other changes, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 3 - Derivative Instruments Trading Arrangements, by Individual [Table] Note 4 - Fair Value Measurements Material Terms of Trading Arrangement [Text Block] Note 5 - Liability for Future Policyholder Benefits Note 6 - Deposit-type Contracts Financial Instrument [Axis] Note 7 - Deferred Acquisition Costs Note 11 - Accumulated Other Comprehensive Income (Loss) Note 1 - Description of Business and Significant Accounting Policies - Impact of Adoption (Details) us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Debt Securities, Gross Unrealized Losses Debt securities, gross unrealized gains us-gaap_Investments Total investments Note 2 - Investments - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Investments (Details) Condensed Financial Statements [Text Block] us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities Accounts payable and accrued expenses Note 2 - Investments - Amortized Cost and Fair Value of Debt Securities By Contractual Maturity (Details) Schedule of Investments [Table] Note 2 - Investments - Realized Gains and Losses Related to the Sale of Securities (Details) Condensed Financial Statements [Table Text Block] Schedule of Mortage Loans by Loan-to-Value Ratio [Table Text Block] Tabular disclosure of mortgage loans by loan-to-value ratio. Note 2 - Investments - Gross Unrealized Losses (Details) Second Mortgage [Member] Other invested assets Other invested assets Business Description and Accounting Policies [Text Block] Note 2 - Investments - Mortgage Loans by Property Type (Details) Reinsurer [Member] Represents information related to reinsurer. Note 2 - Investments - Mortgage Loans by Loan-to-value Ratio (Details) Individual Life Products [Member] Includes the Sound and Solid Term Life and Pioneer Whole Life products. Note 2 - Investments - Mortgage Loans by Maturity Date (Details) Industrial Property [Member] Note 2 - Investments - Valuation Allowance on Securities (Details) usac_NumberOfWhollyOwnedOperatingSubsidiaries Number of Wholly-Owned Operating Subsidiaries Represents the number of wholly-owned operating subsidiaries. Note 2 - Investments - Summary of Mortgage Loans by Aging Category (Details) Note 2 - Investments - Components of Net Investment Income (Details) Note 2 - Investments - Schedule of Investment Gains (Losses) (Details) Debt-to-Value Ratio, 30 to 40 Percent [Member] Debt-to-value (DTV) ratio from 30 to 40%. Element name and standard label in DTV [numeric lower end] to [numeric higher end] Percent [Member] format. Note 3 - Derivative Instruments - Fair Value of Derivative Financial Instruments (Details) Counterparty Name [Axis] us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent Note 4 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) Critical Illness [Member] Represents critical illness insurance. Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) Note 4 - Fair Value Measurements - Estimated Fair Values of the Company's Financial Assets and Liabilities (Details) Debt-to-Value Ratio, 40 to 50 Percent [Member] Debt-to-value (DTV) ratio from 40 to 50%. Element name and standard label in DTV [numeric lower end] to [numeric higher end] Percent [Member] format. Debt-to-Value Ratio, 60 to 70 Percent [Member] Debt-to-value (DTV) ratio from 60 to 70%. Element name and standard label in DTV [numeric lower end] to [numeric higher end] Percent [Member] format. Note 5 - Liability for Future Policyholder Benefits - Liability for Future Policyholder Benefits (Details) Salaries & benefits Note 6 - Deposit-type Contracts - Schedule of Deposit-type Contracts (Details) Note 7 - Deferred Acquisition Costs - Schedule of Deferred Acquisition Costs (Details) us-gaap_IncreaseDecreaseInUnearnedPremiums Advance premiums Note 11 - Accumulated Other Comprehensive Income (Loss) - Condensed Financial Statements (Details) Notes To Financial Statements Financial Instruments [Domain] Notes To Financial Statements [Abstract] Counterparty Name [Domain] Balance (in shares) us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) (Increase) decrease in operating assets: Segment Reporting [Text Block] US Treasury securities Available-for-sale securities, less than 12 months, fair value Increase (decrease) in operating liabilities: Adjustments to reconcile net loss to net cash provided by operating activities: Total Liabilities us-gaap_Liabilities Total liabilities Liabilities: us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and shareholders' equity Embedded derivative Change in fair value of embedded derivative us-gaap_PolicyLoansReceivable Policy loans Lodging [Member] Represents lodging. Reinsurance contract allocated hedge Fair value of derivative financial instruments, asset Segment Reporting [Table] Mixed Use [Member] Represents mixed use. Fair value of derivative financial instruments, liability Reinsurance contract allocated hedge Commissions, net of deferrals Debt-to-Value Ratio, 70 to 80 Percent [Member] Debt-to-value (DTV) ratio from 70 to 80%. Element name and standard label in DTV [numeric lower end] to [numeric higher end] Percent [Member] format. Portion at Fair Value Measurement [Member] Reported Value Measurement [Member] Fair Value, by Balance Sheet Grouping [Table] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase (decrease) in cash and cash equivalents us-gaap_CashAndCashEquivalentsFairValueDisclosure Cash and cash equivalents Estimate of Fair Value Measurement [Member] Limited partnership interests Limited partnership interests Represents information related to limited partnership interest. New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Beginning Ending Statement [Table] us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss Debt Securities, Gross Unrealized Loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Available-for-sale securities, fair value Investments, fair value us-gaap_InvestmentsFairValueDisclosure Equity securities, at fair value Equity Securities [Member] us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Multifamily [Member] Financing Receivable, Past Due [Table Text Block] us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure Federal Home Loan Bank advance Other income Product and Service [Domain] Product and Service [Axis] us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss Unrealized losses on equity securities Single Family [Member] Death claims Amount of expense related to death claims incurred during the period. Increase in policyholder reserves Increase in policyholder reserves Policy benefits Policyholder benefits Amount of expense related to policy benefits incurred during the period. Revision of Prior Period [Domain] us-gaap_MortgageLoansOnRealEstate Mortgage loans on real estate Revision of Prior Period [Axis] Accounts payable and accrued expenses Cumulative Effect, Period of Adoption, Adjustment [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Domain] Gain (Loss) on Securities [Table Text Block] Assets Measurement Frequency [Axis] Commitments and Contingencies Disclosure [Text Block] Statement [Line Items] Interest credited Interest credited on deposit type contracts Fair Value, Net Asset (Liability) us-gaap_FairValueNetAssetLiability Fair Value Hierarchy and NAV [Axis] Common stock, shares issued (in shares) Common Stock, Shares, Issued (in shares) Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding (in shares) Common stock, shares authorized (in shares) Common Stock, Shares Authorized (in shares) Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Common stock, $0.10 par value. Authorized 20,000,000 shares; issued and outstanding 7,788,922 and 7,788,922 shares as of June 30, 2026 and December 31, 2025, respectively Policy loans usac_IncreaseDecreaseInDeferredPolicyAcquisitionCostsCostsCapitalized Deferred acquisition costs capitalized The increase (decrease) during the reporting period in the balance sheet value of capitalized sales costs that are associated with acquiring a new insurance customers, attributable to costs capitalized. Deferred acquisition costs amortized usac_IncreaseDecreaseInDeferredPolicyAcquisitionCostsCostsAmortized Deferred acquisition costs amortized The increase (decrease) during the reporting period in the balance sheet value of capitalized sales costs that are associated with acquiring a new insurance customers, attributable to costs amortized. Expenses: us-gaap_DeferredPolicyAcquisitionCostExperienceAdjustment Experience Adjustments us-gaap_BenefitsLossesAndExpenses Total expenses us-gaap_PolicyTextBlockAbstract Accounting Policies Area of Operation, Policy [Policy Text Block] Disclosure of accounting policy for the areas in which the entity is authorized to operate. us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Comprehensive loss us-gaap_ComprehensiveIncomeNetOfTax Comprehensive (loss) income Balance us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange New issues us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumIssuance Subsequent Events [Text Block] usac_DebtAndEquitySecuritiesRealizedGainLossAndNetCreditLosses Net losses realized on the sale of securities and net credit losses recognized in operations Amount of realized gain (loss) on investment in debt and equity securities Accounting Standards Update 2018-12 [Member] usac_DebtAndEquitySecuritiesRealizedGainLossGross Net security losses Amount of realized gain (loss) on investment in debt and equity securities. Derecognition (lapses) us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumDerecognition Federal Home Loan Bank advance Impact to retained earnings (accumulated deficit) from capping of net premium ratio at transition date us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected Net premiums collected Interest accrual us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome Balance Expected future benefits and expenses, discounted New issues us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance usac_InvestmentIncomeDueAndAccruedFairValueDisclosure Investment income due and accrued Fair value portion of investment income due and accrued. Effect of actual variances from expected experience us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience Impact of deferred profit liability us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumIncreaseDecreaseForOtherChange Effect of changes in cash flow assumptions us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseFromCashFlowChange Effect of actual variances from expected experience us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience us-gaap_DepositsFairValueDisclosure Policyholder deposits in deposit-type contracts Effect of changes in cash flow assumptions us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange usac_IncreaseDecreaseInDividendAccumulation Dividend accumulation The amount of increase (decrease) in dividend accumulation. us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDerecognition Surrender/maturity Other benefits us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIncreaseDecreaseForOtherChange Interest accrued us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense usac_SubscriptionAgreementCapitalCommitment Subscription Agreement, Capital Commitment The amount of capital commitment under subscription agreement. Mutual Capital Investment Fund, LP [Member] Related to Mutual Capital Investment Fund, LP. us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue Fair value, beginning of period Proceeds from mortgage repayments Expected future benefits and expenses, undiscounted Debt securities, amortized cost, total Available for sale securities, amortized cost Cost or Amortized Cost Expected future gross premiums, undiscounted us-gaap_PolicyholderAccountBalanceWithdrawal Withdrawals Deposits received Debt-to-Value Ratio, Over 80 Percent [Member] Represents the debt-to-value ratio of over 80 percent. Statement of Stockholders' Equity [Abstract] Equity securities, fair value us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent Statement of Cash Flows [Abstract] Limited Partnership Interests [Member] Represents limited partnership interests Debt-to-Value [Axis] Debt-to-Value [Domain] First Mortgage [Member] Other comprehensive income Other comprehensive income Other comprehensive (loss) income Fixed Income Securities [Member] Shareholders' Equity: Equity Components [Axis] Real Estate Loan [Member] Equity Component [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] AOCI Attributable to Parent [Member] Fair Value, Inputs, Level 1 [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Corporate Debt Securities [Member] Property, equipment and software, net Financial Asset, Aging [Axis] Subsequent Event [Table] Deferred tax asset, net of valuation allowance Deferred tax asset, net of valuation allowance Financial Asset, Aging [Domain] Change in provision for credit losses Mortgage loans on real estate us-gaap_ProvisionForLoanLeaseAndOtherLosses Increase (decrease) in allowance for credit losses Change in policy owner benefit reserves Policyholder benefit reserves Financial Asset, 30 to 59 Days Past Due [Member] Policyholder benefit reserves us-gaap_LiabilityForFuturePolicyBenefits Policyholder Account Balance [Table Text Block] Net liability for future policy benefits usac_LiabilityForFuturePolicyBenefitBeforeFlooringAndReinsurance Amount, before effect of flooring and reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block] Individual Life [Member] Represents individual life insurance. Impact of flooring usac_LiabilityForFuturePolicyBenefitFlooringOfLiability Amount of flooring of liability at zero at cohort level of liability for future policy benefit. Fair Value Disclosures [Text Block] Liability for Future Policy Benefit Activity [Table] Dividends usac_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDividends Amount of dividends expense for expected future policy benefit and expense component of liability for future policy benefit. Fair Value, by Balance Sheet Grouping [Table Text Block] Expense included in Reserve usac_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitExpenseIncludedInReserve Amount of expense included in reserve for expected future policy benefit and expense component of liability for future policy benefit. Deferred Policy Acquisition Cost [Table] Return of premium usac_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitReturnOfPremium Amount of return on premium for expected future policy benefit and expense component of liability for future policy benefit. Other usac_LiabilityForFuturePolicyBenefitBeforeReinsuranceOther Amount, of changes classified as other and before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. us-gaap_PolicyholderFunds Balance Balance Liability for future policyholder benefits Net liability for future policy benefits, post-flooring Amount, before effect of reinsurance and other changes, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. us-gaap_CurrentFederalTaxExpenseBenefit Total income tax benefit (expense) Incurred but not reported Amount, incurred but not reported and before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. In course of settlements Amount, before effect of reinsurance and in the course of settlements, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. Policyholder Account Balance [Table] Effect of Modified Retrospective Application Accounting Standards Update 2018-12 [Member] Deposit Fund [Member] Represents deposit fund contracts. Deposit-type Contracts [Text Block] The entire disclosure for deposit-type contracts. us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments (Accretion) amortization of investment securities, net Deferred Annuity [Member] Represents a deferred annuity. Balance, beginning of year usac_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeNet Net amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected net premium component of liability for future policy benefit. Less: Reinsurance recoverable usac_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowanceNet Net amount, after allowance for credit loss, recoverable under reinsurance of liability for future policy benefit. usac_PolicyTable Adjusted beginning of year balance usac_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChangeNet Net amount, before effect of reinsurance and after current period update of cash flow assumption, of expected net premium component for liability for future policy benefit, discounted at original rate. us-gaap_PaymentsToAcquireEquitySecuritiesFvNi Purchase of equity investments Deferred Acquisition Cost Products [Member] Represents deferred acquisition cost products. Proceeds from equity sales Critical Illness Products [Member] Represents Critical Illness products. Accumulated Other Comprehensive Income (Loss), taxes usac_AccumulatedOtherComprehensiveIncomeLossTax Amount of tax attributable to accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source. Individual Life and Critical Illness Products [Member] Represents individual life and critical illness insurance products. Accumulated Deficit, taxes usac_RetainedEarningsAccumulatedDeficitTax Amount of tax expense (benefit) allocated to retained earnings (accumulated deficit). Investment income due and accrued Accumulated Deficit usac_RetainedEarningsAccumulatedDeficitBeforeTaxes Amount of accumulated undistributed earnings (deficit) before taxes. Accumulated Other Comprehensive Income (Loss) usac_AccumulatedOtherComprehensiveIncomeLossBeforeTax Amount, before tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source. Other Commitments [Table] Accumulated Other Comprehensive Income (Loss), net of taxes Accumulated other comprehensive loss Effect of change in discount rate assumptions us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax Effect of change in discount rate assumptions us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax us-gaap_PaymentsToAcquireMortgageNotesReceivable Purchase of mortgage investments us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Net (loss) income before tax Additional paid-in capital usac_OtherComprehensiveIncomeLossDiscountRateChangesEffectNetOfTax Effects of discount rate changes, net of tax Amount after tax of effects of discount rate changes on other comprehensive income (loss). Receipts on deposit-type contracts Deferred Policy Acquisition Costs [Table Text Block] us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchase of property, equipment and software us-gaap_PaymentsToAcquireOtherInvestments Purchase of other invested assets Collateralized Mortgage-Backed Securities [Member] Mortgages [Member] Realized loss on charge offs of investments Amount of realized gain (loss) on the write off of debt securities. Financial Asset, Not Past Due [Member] Stock based compensation on restricted stock awards Restricted stock awards Reclassifications, net of tax Current period other comprehensive income, net of tax Stock based compensation on Restricted Stock Awards (in shares) Fixed Maturities [Member] Real estate, net of depreciation Cash flows from operating activities: Cash flows from investing activities: Cash flows from operating activities us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Cash flows from financing activities: us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash (used in) provided by investing activities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt Purchase of fixed income investments Proceeds from fixed income sales and repayments Realized Gain (Loss) on Investments [Table Text Block] Accounting Policies [Abstract] Mortgage Other Than REO Loans [Member] Represents mortgage other than REO loans. Real Estate Owned Loans [Member] Represents Real Estate Owned Loans. US Treasury Securities [Member] Investment income US States and Political Subdivisions Debt Securities [Member] Income Statement [Abstract] us-gaap_DeferredFederalIncomeTaxExpenseBenefit Deferred income tax benefit (expense) Cash and Cash Equivalents [Member] Financial Asset, Greater than 90 Days Past Due [Member] Financial asset greater than 90 days past due. Financial Asset, 61 to 90 Days Past Due [Member] Financial asset more than 60 days past due but fewer than 91 days past due. us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Financial Asset, 1 to 30 Days Past Due [Member] Financial asset fewer than 31 days past due. Allowance for credit loss Universal Life [Member] Financial Asset, 31 to 60 Days Past Due [Member] Financial asset more than 31 days past due but fewer than 61 days past due. Income Tax Contingency [Table] Capitalization Amortization of deferred acquisition costs Amortization of deferred acquisition costs Amortization expense Redeemable Preferred Stock [Member] Deferred acquisition costs, net Deferred acquisition costs, net Balance Balance Nonaccrual Loans With Specific Allowance [Member] Represents nonaccrual loans with specific allowance. Net loss Net loss Net (loss) income Financial Asset, Past Due [Member] Amortization of value of business acquired Value of business acquired amortized us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Write-down or Reserve, Amount us-gaap_AllowanceForLoanAndLeaseLossesRealEstate Allowance for credit losses Net investment income Investment income, net Accounting Standards Update [Domain] Mortgage Loans on Real Estate Mortgage loans on real estate (net of allowance for credit losses of $163,114 and $99,118 as of June 30, 2026 and December 31, 2025) Carrying value Income Tax Disclosure [Text Block] Federal and state income tax receivable Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table Text Block] us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits Death benefits Beginning balance at original discount rate usac_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsuranceNet Amount, before effect of reinsurance and current period update of cash flow assumption, of expected net premium component of liability for future policy benefit, discounted at original rate. usac_DeferredPolicyAcquisitionCostExperienceAdjustmentNet Experience Adjustments Amount of expense for writeoff from unexpected insurance contract termination, charged against previously capitalized deferred policy acquisition cost. us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold Change in allowance for credit loss recognized in earnings Available for sale securities, allowance for credit loss Measurement Basis [Axis] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block] Fair Value Hierarchy and NAV [Domain] Measurement Frequency [Domain] Statement of Financial Position [Abstract] us-gaap_DeferredTaxAssetsValuationAllowance Deferred Tax Assets, Valuation Allowance us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable Investment income due and accrued Value of business acquired, net us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss Investment related gains (losses), net Fixed Annuity [Member] Other assets us-gaap_DepreciationNonproduction Depreciation and amortization usac_LiabilitiesPolicies Total policy liabilities Sum of the carrying amounts as of the balance sheet date of all liabilities related to life insurance policies. usac_PaymentsForIncreaseInPolicyLoansInvestingActivities Increase in policy loans The cash outflow for increase in policy loans classified as an investing activity. Fair Value, Recurring [Member] Other operating expenses us-gaap_IncreaseDecreaseInOtherOperatingAssets Other assets us-gaap_IncreaseDecreaseInDeferredIncomeTaxes Deferred tax assets, net of valuation allowance dei_DocumentType Document Type Document Information [Line Items] Document Quarterly Report Adjusted beginning of year balance us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange Expected future gross premiums, discounted Document Information [Table] us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment Weighted Average Number of Shares Outstanding, Diluted, Adjustment dei_EntityInteractiveDataCurrent Entity Interactive Data Current Document Transition Report us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Weighted Average Number of Shares Outstanding, Diluted us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Weighted Average Number of Shares Outstanding, Basic (in shares) usac_LossOnSaleOfSecuritiesGross Gross losses The gross loss realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. usac_GainOnSaleOfSecuritiesGross Gross gains The gross gain realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. Derivative Instrument [Axis] Net loss per common share, basic and diluted (in dollars per share) Net (loss) income per common share, basic and diluted (in dollars per share) us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs Fair value, end of period us-gaap_WithdrawalFromContractHoldersFunds Withdrawals on deposit-type contracts Debt Securities, Available-for-Sale [Table Text Block] Insurance Disclosure [Text Block] Earnings Per Share, Policy [Policy Text Block] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] usac_FinancialAssetsFairValueDisclosure Total Financial Assets (excluding available for sale investments) Fair value of financial assets as of the balance sheet date. Interest on policy loans Amount of cash inflow from interest on policy loans, classified as investing activity. usac_InvestmentExpenseIncome Less investment expenses Amount of income (expenses) related to the generation of investment income. Document Fiscal Period Focus Multi-property [Member] Represents Information related to multi-property. Document Fiscal Year Focus Amendment Flag Deposit-type contracts Deposit-type contracts Investment income (expense) Amount of income (expense) from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. Common Stock [Member] Goodwill us-gaap_IncreaseDecreaseInOtherOperatingLiabilities Other liabilities After one year through five years The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio, which are due after one year through year five for period end date. dei_DocumentPeriodEndDate Document Period End Date Legal Entity [Axis] us-gaap_FinancialLiabilitiesFairValueDisclosure Total Financial Liabilities us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditRating Policyholder Account Balance, Guaranteed Minimum Credit Rating Net investment gains (losses) Net investment losses dei_EntityFileNumber Entity File Number us-gaap_IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements Change in reinsurance related assets Reinsurance related assets Entity Tax Identification Number us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss Available-for-sale securities, less than 12 months, unrealized loss us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss US Treasury securities Entity [Domain] Entity Central Index Key SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Category [Domain] us-gaap_FinancingReceivableAllowanceForCreditLosses Beginning allowance balance Ending Allowance dei_EntityRegistrantName Entity Registrant Name us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs Financing Receivable, Allowance for Credit Loss, Writeoff Charge-offs dei_EntityCurrentReportingStatus Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Entity Filer Category dei_EntityShellCompany Entity Shell Company Entity Emerging Growth Company Entity Small Business Investments [Domain] srt_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans srt_MortgageLoansOnRealEstateFaceAmountOfMortgages SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages srt_MortgageLoansOnRealEstateInterestRate SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate Recognized gains on sale of investments AOCI, Liability for Future Policy Benefit, Parent [Member] Unrealized net gains recognized in earnings Derivative Instruments and Hedging Activities Disclosure [Text Block] us-gaap_Revenues Total income Income: Entity Address, State or Province Entity Address, City or Town Accumulated Deficit, net of taxes Accumulated deficit Entity Address, Address Line One SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Category [Axis] dei_CityAreaCode City Area Code After one year through five years, amortized cost After five years through ten years, amortized cost usac_LossPercentage Loss Percentage Percentage of total loss. dei_LocalPhoneNumber Local Phone Number Premium income Premium income One year or less, amortized cost Entity Address, Postal Zip Code Derivative [Table] Preferred Stock [Member] Debt securities, fair value Liability for Future Policy Benefit, Activity [Table Text Block] Balance us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance After five years through ten years, fair value Beginning balance at original discount rate us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance More than 10 years, fair value One year or less, fair value Insurance Contract, Acquisition Cost [Text Block] After one year through five years, fair value usac_RecoveryValueEstimatePercentage Recovery Value Estimate, Percentage Percentage of value that is estimated to be recovered. More than 10 years, amortized cost Debt securities, amortized cost Class of Stock [Axis] Debt securities, fair value, total Available for sale fixed maturity securities (amortized cost: $92,554,865 and $90,036,854, net of allowances for credit losses of $0, as of June 30, 2026 and December 31, 2025) Debt securities, fair value Class of Financing Receivable [Axis] Class of Financing Receivable [Domain] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Net liability for future policy benefits, after reinsurance recoverable us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance Total liability for future policyholder benefits Unrealized net holding gains (losses) arising during the period, net of tax Advance premiums us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements Principal payment us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases Acquisition Real Estate [Domain] Real Estate, Type of Property [Axis] Investments Classified by Contractual Maturity Date [Table Text Block] us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments Proceeds from Sale, Maturity and Collection of Investments Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) Other liabilities Basis of Accounting, Policy [Policy Text Block] Accounting Standards Update [Axis] Previously Reported [Member] Derivative Contract [Domain] usac_FinancingReceivableAdditionalImpairment Financing Receivable, Allowance for Credit Loss, Writeoff Amount of additional impairment on financing receivable. Receivable [Domain] Total Assets us-gaap_Assets Total assets us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax Reclassification adjustment for gains (losses) included in net income Cash and cash equivalents: Cash and cash equivalents Condensed Financial Statements [Table] Proceeds from other invested assets Amount of cash inflow from other invested assets. us-gaap_InvestmentOwnedAtFairValue Investment Owned, Fair Value Investment Holdings [Text Block] Total Commercial mortgage loans Financing Receivable, before Allowance for Credit Loss srt_MortgageLoansOnRealEstateNumberOfLoans SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Number of Loans Other Invested Assets [Member] Represents other invested assets. Term Loans [Member] Represents term loans. Debt-to-Value Ratio, 50 to 60 Percent [Member] Debt-to-value (DTV) ratio from 50 to 60%. Investment Type [Axis] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Reinsurance related assets Reinsurance related assets Consolidation, Policy [Policy Text Block] Receivable Type [Axis] Specific Allowance [Member] Represents specific allowance. Investment Income [Table Text Block] General Allowance [Member] Represents general allowance. usac_FundedCommitmentsForInvestmentInLimitedPartnershipInterest Funded Commitments for Investment in Limited Partnership Interest Represents funded commitments for investment in limited partnership interest. Retail [Member] Balance us-gaap_StockholdersEquity Total shareholders' equity Balance Balance Debt-to-Value Ratio, 20 to 30 Percent [Member] Debt-to-value (DTV) ratio from 20 to 30%. Element name and standard label in DTV [numeric lower end] to [numeric higher end] Percent [Member] format. Debt-to-Value Ratio, 10 to 20 Percent [Member] Debt-to-value (DTV) ratio from 10 to 20%. Element name and standard label in DTV [numeric lower end] to [numeric higher end] Percent [Member] format. Dividend accumulation Schedule of Mortgage Loans by Maturity Date [Table Text Block] Tabular disclosure of mortgage loans by maturity date. ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] One year or less The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio, which are due in one year or less after the period end date.