Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Risks Relating to Our Business [Member] Risks Relating to Our Business Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] O 2027 M3 Dividends O 2027 M3 Dividends [Member] O 2027 M3 Dividends Title of 12(b) Security Net increase (decrease) in net assets resulting from operations - diluted Net Income (Loss) Available to Common Stockholders, Diluted Subsequent Event Subsequent Event [Member] Voya CLO 2014-1, Ltd. Voya CLO 2014-1, Ltd. [Member] Voya CLO 2014-1, Ltd. Weighted average interest rate Weighted Average Interest Rate Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Members of Nationwide Management Members of Nationwide Management [Member] Members of Nationwide Management Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] O 2026 M8 Dividends O 2026 M8 Dividends [Member] O 2026 M8 Dividends Debt Securities, First Lien 1 Debt Securities, First Lien1 [Member] Debt Securities, First Lien1 Schedule of Fair Value of Investments Fair Value, Assets Measured on Recurring Basis [Table Text Block] Preferred Stock to Common Stock Preferred Stock to Common Stock [Member] Preferred Stock to Common Stock Abbie Lakes OH Partners, LLC Abbie Lakes OH Partners, LLC [Member] Abbie Lakes OH Partners, LLC Appalachian Energy LLC Appalachian Energy LLC [Member] Appalachian Energy LLC Derivative Instrument [Axis] Derivative Instrument [Axis] Non-accrual loans Debt Securities, Non-Accrual Status [Member] Debt Securities, Non-Accrual Status Non-controlled/affiliated Investment, Affiliated Issuer, Noncontrolled [Member] Subsidiary of Limited Liability Company or Limited Partnership [Line Items] Subsidiary of Limited Liability Company or Limited Partnership [Line Items] Net Assets Net Assets [Member] Net Assets Kengary Way OH Partners, LLC Kengary Way OH Partners, LLC [Member] Kengary Way OH Partners, LLC Consolidated Entities [Axis] Consolidated Entities [Axis] Average cost per share, gross (usd per share) Shares Acquired, Average Cost Per Share Entity Common Stock, Shares Outstanding Trading Companies & Distributors Trading Companies & Distributors Sector [Member] Trading Companies & Distributors Sector Wolf Energy, LLC Wolf Energy, LLC [Member] Wolf Energy, LLC Registration expenses Investment Company, Registration Expense Energy Equipment & Services Energy Equipment & Services Sector [Member] Energy Equipment & Services Sector Minimum annualized dividend rate Temporary Equity, Minimum Annualized Dividend Rate Temporary Equity, Minimum Annualized Dividend Rate Managerial assistance Managerial Assistance Fee Income Burgess Point Purchaser Corporation Burgess Point Purchaser Corporation [Member] Burgess Point Purchaser Corporation Related Party Agreements and Transactions Related Party Transactions Disclosure [Text Block] Consolidated Entities [Domain] Consolidated Entities [Domain] Armed Forces Communications, Inc. Armed Forces Communications, Inc. [Member] Armed Forces Communications, Inc. Advisory Fee Investment Advisory Fee Investment Company, Nonconsolidated Subsidiary [Axis] Investment Company, Nonconsolidated Subsidiary [Axis] Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share July 15, 2026 – June 15, 2031 Debt Instrument Redemption Period Fifteen [Member] Debt Instrument Redemption Period Fifteen Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Enterprise market cash flow approach and option pricing model Enterprise Market Cash Flow Approach And Option Pricing Model [Member] Enterprise Market Cash Flow Approach And Option Pricing Model 2018 Notes 2018 Notes [Member] 2018 Notes Accretion of premiums, net Accretion (Amortization) of Discounts and Premiums, Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Series M3 6.50% Series M3 Preferred Stock [Member] 6.50% Series M3 Preferred Stock 2028 Notes 2028 Notes [Member] 2028 Notes Number of reportable segments Number of Reportable Segments Current liabilities Liabilities, Current Preferred Stock 4 Preferred Stock 4 [Member] Preferred Stock 4 Apidos CLO XV Apidos CLO XV [Member] Apidos CLO XV MITY, Inc. MITY, Inc. [Member] MITY, Inc. Debt Securities, Second Lien 3 Debt Securities, Second Lien 3 [Member] Debt Securities, Second Lien 3 Industry Concentration Risk Industry Concentration Risk [Member] Industry Concentration Risk Concentration Risk [Table] Concentration Risk [Table] Entity Address, City or Town Option to purchase term Debt, Option to Purchase Term Debt, Option to Purchase Term Willows at North End Owner LLC Willows at North End Owner LLC [Member] Willows at North End Owner LLC Vesper Campus Quarters, LLC Vesper Campus Quarters, LLC [Member] Vesper Campus Quarters, LLC Statement of Financial Position [Abstract] Title of Individual [Domain] Title and Position [Domain] Common Equity Common Equity [Member] Common Equity 5.35% Preferred Stock 5.35% Series A Fixed Rate Cumulative Perpetual Preferred Stock [Member] 5.35% Series A Fixed Rate Cumulative Perpetual Preferred Stock Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Wolf Energy Wolf Energy [Member] Wolf Energy Cent CLO 21 Limited Cent CLO 21 Limited [Member] Cent CLO 21 Limited Number of accredited investors Number of Accredited Investors Number of Accredited Investors Taxable income before deductions for distributions Investment Company, Tax Basis, Taxable Income (Loss), before Deduction for Distribution Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] SportCo Holdings, Inc. SportCo Holdings, Inc. [Member] SportCo Holdings, Inc. Entity Well-known Seasoned Issuer Ratio of operating expenses to average net assets applicable to common shares Investment Company Expense Ratio Of Operating Expenses To Average Net Assets Investment Company Expense Ratio Of Operating Expenses To Average Net Assets Net investment income (in dollars per share) Investment Company, Investment Income (Loss), Per Share, Basic Tax reclassifications of net assets (Note 12) Investment Company, Tax Reclassification of Net Assets Investment Company, Tax Reclassification of Net Assets Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Investment interest rate Investment Interest Rate Change of control triggering event threshold Change of Control Triggering Event Threshold Change of Control Triggering Event Threshold Floor Investment, Interest Rate, Floor Lucky US BuyerCo LLC Lucky US BuyerCo LLC [Member] Lucky US BuyerCo LLC Silver Hill Mineral Lease Silver Hill Mineral Lease [Member] Silver Hill Mineral Lease Dividends [Domain] Dividends [Domain] Total dividend income Dividend Income Dividend Income, Operating Name of Property [Axis] Name of Property [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Reclassification, Adjustment Revision of Prior Period, Reclassification, Adjustment [Member] Market price threshold Market Price Threshold Market Price Threshold Use of Estimates Use of Estimates, Policy [Policy Text Block] Members of Valley Electric Company, Inc. Members of Valley Electric Company, Inc. [Member] Members of Valley Electric Company, Inc. Related Party [Axis] Related and Nonrelated Parties [Axis] Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Maturity Date Range Two Debt Instrument, Redemption, Period Two [Member] Proceeds from debt, net of issuance costs Proceeds from Debt, Net of Issuance Costs O 2026 M6 Dividends O 2026 M6 Dividends [Member] O 2026 M6 Dividends Credit Facility, Usage [Domain] Credit Facility, Usage [Domain] Credit Facility, Usage [Domain] Document Period End Date Number of additional assets transferred out of Level 2 to Level 3 Number of Additional Assets Transferred Out Of Level 2 To Level 3 Number of Additional Assets Transferred Out Of Level 2 To Level 3 Octagon Investment Partners XV, Ltd. Octagon Investment Partners XV, Ltd. [Member] Octagon Investment Partners XV, Ltd. Subsidiaries Subsidiaries [Member] Dividends payable (usd per share) Dividends Payable, Amount Per Share Derivative liabilities: Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction [Abstract] Tender Offer Tender Offer [Member] Tender Offer Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Face amount Debt Instrument, Face Amount Net Assets Applicable to Common Shares Net Assets Effective Interest Rate Debt Instrument, Interest Rate, Effective Percentage Adjustment for Incentive Fee on Convertible Instruments Dilutive Securities, Effect on Basic Earnings Per Share, Adjustment for Incentive Fee on Convertible Instruments Dilutive Securities, Effect on Basic Earnings Per Share, Adjustment for Incentive Fee on Convertible Instruments Strategic Chemical Solutions Corp. (f/k/a USES Corp.) Strategic Chemical Solutions Corp Strategic Chemical Solutions Corp [Member] Strategic Chemical Solutions Corp Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Structured Finance Structured Finance Sector [Member] Structured Finance Sector Consolidation Items [Domain] Consolidation Items [Domain] NPRC Rutland LLC NPRC Rutland LLC [Member] NPRC Rutland LLC Schedule of Composition of Investment Portfolio Investment Holdings, Schedule of Investments [Table Text Block] Net Increase (Decrease) in Net Assets per Common Share Earnings Per Share [Text Block] Conversion of preferred stock to common stock Temporary Equity, Value, Conversion of Convertible Securities Temporary Equity, Value, Conversion of Convertible Securities Basic and diluted earnings (loss) per common share (Note 11) Earnings Per Share [Abstract] Media Media Sector [Member] Media Sector Document Fiscal Period Focus O 2026 Q3 Dividends O 2026 Q3 Dividends [Member] O 2026 Q3 Dividends Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Capital Transactions Investment Company, Capital Share Transaction, Increase (Decrease) [Abstract] Total Liabilities  Liabilities Trading Symbol Discount rate Measurement Input, Discount Rate [Member] Debt Securities, First Lien 6 Debt Securities, First Lien6 [Member] Debt Securities, First Lien6 Accordion feature, increase limit Line of Credit Facility, Increase in Credit Limit Line of Credit Facility, Increase in Credit Limit MITY Holdings of Delaware Inc. MITY Holdings of Delaware Inc. [Member] MITY Holdings of Delaware Inc. Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] 6.375% 2024 Notes 6.375 2024 Notes [Member] 6.375 2024 Notes Income Tax Disclosure [Abstract] Gain (loss) on Accretion to Redemption Value of Preferred Stock Gain (Loss) on Accretion to Redemption Value of Preferred Stock Gain (Loss) on Accretion to Redemption Value of Preferred Stock Repurchase of preferred stock, difference between proceeds and carrying value Repurchase of Preferred Stock, Difference Between Proceeds and Carrying Value Repurchase of Preferred Stock, Difference Between Proceeds and Carrying Value Pacific World Corporation Pacific World Corporation [Member] Pacific World Corporation Series A4 6.50% Series A4 Preferred Stock [Member] 6.50% Series A4 Preferred Stock Concentration Risk [Line Items] Concentration Risk [Line Items] Cost basis, gross additions Investments Owned, At Cost, Gross Additions Investments Owned, At Cost, Gross Additions Net change in unrealized gains (losses) from derivative instruments and foreign currency transactions Unrealized Gain (Loss), Foreign Currency Transaction And Derivatives, after Tax Unrealized Gain (Loss), Foreign Currency Transaction And Derivatives, after Tax Common Equity/Interests/Warrants 10 Common Stock, Interests Or Warrants10 [Member] Common Stock, Interests Or Warrants10 Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Credit Facility [Domain] Credit Facility [Domain] Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Sterling Place Holdings LLC Sterling Place Holdings LLC [Member] Sterling Place Holdings LLC QC Holdings TopCo, LLC QC Holdings TopCo, LLC [Member] QC Holdings TopCo, LLC Other temporary book-to-tax differences Investment Company, Tax Basis, Other, Increase (Decrease) Common Equity/Interests/Warrants 5 Common Stock, Interests Or Warrants5 [Member] Common Stock, Interests Or Warrants5 Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 SSN SSN [Member] SSN Global Tel*Link Corporation (d/b/a ViaPath Technologies.) Global Tel*Link Corporation (d/b/a ViaPath Technologies.) [Member] Global Tel*Link Corporation (d/b/a ViaPath Technologies.) Dividends payable Dividends Payable Redemption of Preferred Stock Temporary Equity, Shares, Redemption of Preferred Stock, Value Temporary Equity, Shares, Redemption of Preferred Stock, Value Wolf Energy Services Company, LLC Wolf Energy Services Company, LLC [Member] Wolf Energy Services Company, LLC Vesper Corpus Christi, LLC Vesper Corpus Christi, LLC [Member] Vesper Corpus Christi, LLC Adjustment for dividends on Convertible Preferred Stock Convertible Preferred Dividends, Net of Tax, Adjustment Convertible Preferred Dividends, Net of Tax, Adjustment Schedule of Changes in Fair Value of Level 3 Investments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Financing Costs Deferred Charges, Policy [Policy Text Block] Other general and administrative expenses Other General and Administrative Expense 7.50% Series A5 Preferred Stock Series A5 7.50% Series A5 Preferred Stock [Member] 7.50% Series A5 Preferred Stock Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Equity Offerings, Offering Expenses, and Distributions Equity Offerings, Offering Expenses, and Distributions [Text Block] Equity Offerings, Offering Expenses, and Distributions 23275 Riverside Drive Owner, LLC 23275 Riverside Drive Owner, LLC [Member] 23275 Riverside Drive Owner, LLC Investment Company, Financial Highlights [Roll Forward] Investment Company, Financial Highlights [Roll Forward] Award Timing Predetermined Award Timing Predetermined [Flag] Freedom Marine Solutions, LLC Freedom Marine Solutions, LLC [Member] Freedom Marine Solutions, LLC Repayment of loan Investment Company, Debt Instrument, Amount Repaid to Principal, Excess (Less) Schedule of Investment Company, Distribution to Shareholders Investment Company, Distribution To Shareholders [Table Text Block] Investment Company, Distribution To Shareholders PIK Rate - Paid as cash Investment, Interest Rate, Paid as Cash Investment, Interest Rate, Paid as Cash Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Equity funding Investment Company, Equity Financing Investment Company, Equity Financing Level 1 Fair Value, Inputs, Level 1 [Member] 2nd Lien Term Loan Debt Securities, 2nd Lien Term Loan [Member] Debt Securities, 2nd Lien Term Loan Schedule of Industries Comprising Greater than 10% of Portfolio Fair Value Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Professional Services Professional Services Sector [Member] Professional Services Sector MAC Discount, LLC Mac Discount LLC [Member] Mac Discount LLC NMMB, Inc. NMMB, Inc. [Member] NMMB, Inc. Series A1, Series M1, and Series M2, Series A3, Series M3, Series A4, Series M4, Series A5 and Series M5 Shares Series A1, Series M1, and Series M2, Series A3, Series M3, Series A4, Series M4, Series A5 and Series M5 Shares [Member] Series A1, Series M1, and Series M2, Series A3, Series M3, Series A4, Series M4, Series A5 and Series M5 Shares Affiliate investments Investment, Affiliated Issuer [Member] O 2025 M4 Dividends O 2025 M4 Dividends [Member] O 2025 M4 Dividends Total Net Operating Expenses Investment Company, Expense, after Reduction of Fee Waiver and Reimbursement Preferred stock, par value (usd per share) Preferred Stock, Par or Stated Value Per Share Fair Value Long-Term Debt, Fair Value Scenario [Domain] Scenario [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] 5.50% Preferred Stock 5.50% Preferred Stock [Member] 5.50% Preferred Stock Administration Other Affiliates [Member] Net realized losses Debt and Equity Securities, Realized Gain (Loss) Net of Gain (Loss) from Debt Extinguishment Debt and Equity Securities, Realized Gain (Loss) Net of Gain (Loss) from Debt Extinguishment Calculated interest basis, number of months Calculated Interest Basis, Number of Months Calculated Interest Basis, Number of Months Concentration Risk Type [Domain] Concentration Risk Type [Domain] BFC-SDR, LLC BFC-SDR, LLC [Member] BFC-SDR, LLC Offsetting Assets [Table] Offsetting Assets [Table] Lakepoint OH Partners, LLC Lakepoint OH Partners, LLC [Member] Lakepoint OH Partners, LLC Reclassified into earnings Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net More than 60% Drawn Credit Facility, Usage, More than 60% Drawn [Member] Credit Facility, Usage, More than 60% Drawn The RK Logistics Group, Inc. The RK Logistics Group, Inc. [Member] The RK Logistics Group, Inc. Market yield Measurement Input, Market Yield [Member] Measurement Input, Market Yield Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Revolving Credit Facility (Notes 4 and 8) Credit facility outstanding balance Long-Term Line of Credit Time dividends have remained unpaid Unpaid Dividends, Preferred Stock, Term Unpaid Dividends, Preferred Stock, Term 1 Month SOFR 1 Month SOFR [Member] 1 Month SOFR Payments of dividends, common stock Payments of Ordinary Dividends, Common Stock Investment Advisory And Management Agreement Incentive Rate Pre Incentive Fee Net Investment Income Exceeds Catch Up Threshold Member Investment Advisory And Management Agreement Incentive Rate Pre Incentive Fee Net Investment Income Exceeds Catch Up Threshold [Member] Investment Advisory And Management Agreement Incentive Rate Pre Incentive Fee Net Investment Income Exceeds Catch Up Threshold Shares issued through reinvestment of dividends Temporary Equity, Value, Dividend Reinvestment Plan Temporary Equity, Value, Dividend Reinvestment Plan Expiration Date Trading Arrangement Expiration Date Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation O 2025 M9 Dividends O 2025 M9 Dividends [Member] O 2025 M9 Dividends 2030 Long-Term Debt, Maturity, Year Four Upstream Holdco, Inc. Upstream Holdco, Inc. [Member] Upstream Holdco, Inc. Hedging Relationship [Axis] Hedging Relationship [Axis] Liquidation Trust Liquidation Trust [Member] Liquidation Trust Reimbursements Reimbursements [Member] Reimbursements Administration agreement, termination period without penalties Administration Agreement, Termination Period Without Penalties Administration Agreement, Termination Period Without Penalties Gross Amounts of Financial Instruments Not Offset in Consolidated Statements of Assets and Liabilities Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Net Amount Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction Subordinated Structured Notes Subordinated Debt [Member] Nonrelated Party Nonrelated Party [Member] Affiliated Entity Affiliated Entity [Member] Notes Unsecured Debt Number of fractional share Number Of Fractional Share Exchanged Number Of Fractional Share Exchanged Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] O 2026 M12 Dividends O 2026 M12 Dividends [Member] O 2026 M12 Dividends 5.50% Series A1 Preferred Stock Series A1 5.50% Series A1 Preferred Stock [Member] 5.50% Series A1 Preferred Stock Net Investment Income Net investment income Investment Income, Operating, after Expense and Tax Prospect Administration Prospect Administration [Member] Prospect Administration NPRC Fairburn LLC NPRC Fairburn LLC [Member] NPRC Fairburn LLC August 15, 2029 – December 15, 2034 Debt Instrument Redemption Period Twenty Eight [Member] Debt Instrument Redemption Period Twenty Eight TP Stillwater, LLC TP Stillwater, LLC [Member] TP Stillwater, LLC Decrease to Subordinated Structured Notes cost, net Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Decrease to Subordinated Structured Notes Cost, Net Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Decrease to Subordinated Structured Notes Cost, Net Entity Voluntary Filers Related Party Transaction [Axis] Related Party Transaction [Axis] Members of R-V Industries Management Members of R-V Industries Management [Member] Members of R-V Industries Management Document Financial Statement Error Correction Repayments and sales of portfolio investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales And Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales And Settlements Repurchase program, authorized amount (in shares) Temporary Equity, Repurchase Program, Authorized, Number of Shares Temporary Equity, Repurchase Program, Authorized, Number of Shares Temporary Equity [Line Items] Temporary Equity [Line Items] 3 Month SOFR 3 Month SOFR [Member] 3 Month SOFR Revolving Credit Facility Convertible Notes Fair Value and Maturity of Debt Outstanding Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Convertible Preferred Stock Convertible Preferred Stock [Member] Deferred financing costs on Revolving Credit Facility (Note 4) Debt financing costs Debt Issuance Costs, Net Other Income Disclosure [Abstract] Other Income Disclosure Open Forward Foreign Currency Contract, Identifier [Axis] Open Forward Foreign Currency Contract, Identifier [Axis] Payment-In-Kind interest and dividend income Interest Income, Operating And Non-Cash, Paid in Kind And Dividend Income Interest Income, Operating And Non-Cash, Paid in Kind And Dividend Income AerLift Leasing Limited AerLift Leasing Limited [Member] AerLift Leasing Limited Number of board of directors appointed Number of Board of Directors Appointed Number of Board of Directors Appointed PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Japs-Olson Company, LLC Japs-Olson Company, LLC [Member] Japs-Olson Company, LLC Credit Central, LLC Credit Central, LLC [Member] Credit Central, LLC After 5 Years Long-Term Debt, Maturity, after Year Five Dividend rate Temporary Equity, Dividend Rate, Percentage Temporary Equity, Dividend Rate, Percentage Stated rate Interest Rate Range Debt Instrument, Interest Rate, Stated Percentage Net Assets Applicable to Common Shares Beginning of period, Net Assets End of period, Net Assets Net assets at end of year Equity, Attributable to Parent Investment Company, Nonconsolidated Subsidiary [Table] Investment Company, Nonconsolidated Subsidiary [Table] Incentive fee Incentive Fee Payable Real Estate [Domain] Real Estate [Domain] Offsetting Assets [Line Items] Offsetting Assets [Line Items] Assets Assets [Abstract] EBITDA multiple Measurement Input, EBITDA Multiple [Member] Due from broker Receivable from Broker-Dealer and Clearing Organization Distributions received, or entitled to be received, Investment Owned, Distribution Received and Receivable Investment Owned, Distribution Received and Receivable Benchmark percept of share price Benchmark Percept Of Share Price Benchmark Percept Of Share Price Common stock transactions (in dollars per share) Investment Company, Common Stock Transactions, Per Share Investment Company, Common Stock Transactions, Per Share Number of equity positions transferred Number Of Equity Positions Transferred Number Of Equity Positions Transferred Galaxy XXVIII CLO, Ltd. Galaxy XXVIII CLO, Ltd. [Member] Galaxy XXVIII CLO, Ltd. Audit, compliance and tax related fees Professional Fees Insider Trading Policies and Procedures [Line Items] O 2025 M2 Dividends O 2025 M2 Dividends [Member] O 2025 M2 Dividends Consolidated revenue interest threshold for 12 month period Consolidated Revenue Interest Threshold for 12 Month Period Consolidated Revenue Interest Threshold for 12 Month Period Investment, Issuer Affiliation [Domain] Investment, Issuer Affiliation [Domain] Offering costs from issuance of preferred stock Payments of Stock Issuance Costs of Preferred Stock Payments of Stock Issuance Costs of Preferred Stock 5.50% 2030 Notes 5.50% 2030 Notes [Member] 5.50% 2030 Notes June 15, 2027 – November 15, 2029 Debt Instrument Redemption Period Sixteen [Member] Debt Instrument Redemption Period Sixteen November 15, 2038 – May 15, 2039 Debt Instrument Redemption Period Twenty Four [Member] Debt Instrument Redemption Period Twenty Four Unsecured Debt Debt Securities, Unsecured Debt [Member] Debt Securities, Unsecured Debt Number of operating segments Number of Operating Segments Antidilutive securities excluded from computation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Auditor Location Entity Central Index Key Accreted Original Issue Discount Accretion of Discounts and Premiums, Investments Accretion of Discounts and Premiums, Investments Follow-On Acquisitions (Excluding initial investment cost) Investment Owned, Cumulative Follow-On Additions Investment Owned, Cumulative Follow-On Additions Issuable to Common Stock Holders Pursuant to Dividend Reinvestment and Direct Stock Purchase Plans Issuable to Common Stock Holders Pursuant to Dividend Reinvestment and Direct Stock Purchase Plans [Member] Issuable to Common Stock Holders Pursuant to Dividend Reinvestment and Direct Stock Purchase Plans SPCP Edge CL Owner LLC SPCP Edge CL Owner LLC [Member] SPCP Edge CL Owner LLC Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Distributions to Shareholders (Note 12) Investment Company, Distribution to Shareholders [Abstract] Encinitas Watches Holdco, LLC Encinitas Watches Holdco, LLC [Member] Encinitas Watches Holdco, LLC Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Investment Management Agreement - Incentive Rate, Realized Capital Gains Investment Management Agreement - Incentive Rate, Realized Capital Gains [Member] Investment Management Agreement - Incentive Rate, Realized Capital Gains Amount Distributed Dividends, Preferred Stock, Cash Dividend Income Revenue Recognition, Dividends [Policy Text Block] Investment, Name [Axis] Investment, Name [Axis] Net realized and change in unrealized gains (losses) (in dollars per share) Investment Company, Gain (Loss) on Investment, Per Share Designated as Hedging Instrument Designated as Hedging Instrument [Member] Dividend rate Preferred Stock, Dividend Rate, Percentage Heatherbridge OH Partners, LLC Heatherbridge OH Partners, LLC [Member] Heatherbridge OH Partners, LLC Number of parts to incentive fee Related Party Transaction, Number Of Components Related Party Transaction, Number Of Components Net change in unrealized gains (losses) Net change in unrealized (gains) losses on investments Net unrealized gains (losses) Debt and Equity Securities, Unrealized Gain (Loss) Basis spread Debt Instrument, Basis Spread on Variable Rate Schedule of Dividends Payable Schedule of Dividends Payable [Table Text Block] Optional over-allotment amount Debt Instrument, Face Amount, Optional Over-Allotment Debt Instrument, Face Amount, Optional Over-Allotment Variable Rate [Domain] Variable Rate [Domain] Maturity Date Range One Debt Instrument, Redemption, Period One [Member] Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Investment, Issuer Name [Domain] Investment, Issuer Name [Domain] Abacus Dermatology Management, LLC Abacus Dermatology Management, LLC [Member] Abacus Dermatology Management, LLC Dividends paid and distributions to common and preferred stockholders Payments of Dividends Financial Services Financial Service Sector [Member] Financial Service Sector Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Spectrum Vision Holdings, LLC Spectrum Vision Holdings, LLC [Member] Spectrum Vision Holdings, LLC O 2027 M5 Dividends O 2027 M5 Dividends [Member] O 2027 M5 Dividends Administration Agreement Administration Agreement [Member] Administration Agreement Number of asset going through foreclosure Investment Transactions, Number of Asset Going Through Foreclosure Investment Transactions, Number of Asset Going Through Foreclosure Net realized gains (losses) Net realized losses on investments Net realized gains (losses) Realized (Loss) Gain Debt and Equity Securities, Realized Gain (Loss) Wolf Energy Holdings, Inc. Wolf Energy Holdings, Inc. [Member] Wolf Energy Holdings, Inc. Rosa Mexicano Rosa Mexicano [Member] Rosa Mexicano Non-current assets Assets, Noncurrent Statement [Line Items] Statement [Line Items] Escrow description Equity Method Investment, Escrow Deposits Equity Method Investment, Escrow Deposits Total Assets  Assets Interest and credit facility expenses Interest Expense, Operating Pharmaceuticals Pharmaceuticals Sector [Member] Pharmaceuticals Sector Capital shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Convertible Notes Convertible Debt [Member] Industry Sector [Axis] Industry Sector [Axis] Reportable Legal Entities Reportable Legal Entities [Member] 7915 Baymeadows Circle Owner, LLC 7915 Baymeadows Circle Owner, LLC [Member] 7915 Baymeadows Circle Owner, LLC Outstanding shares threshold Outstanding Shares Threshold Outstanding Shares Threshold Debt Repayment Condition [Axis] Debt Repayment Condition [Axis] Debt Repayment Condition Proceeds from equity method investments, gross Proceeds From Sale Of Equity Investments, Gross Proceeds From Sale Of Equity Investments, Gross Excise tax expense Investment Company, Excise Tax Expense Olentangy Commons Owner LLC Olentangy Commons Owner LLC [Member] Olentangy Commons Owner LLC Common Equity/Interests/Warrants 4 Common Stock, Interests Or Warrants4 [Member] Common Stock, Interests Or Warrants4 Calculated interest basis, days in month Calculated Interest Basis, Days in Month Calculated Interest Basis, Days in Month Crown Pointe Passthrough LLC Crown Pointe Passthrough LLC [Member] Crown Pointe Passthrough LLC PEO PEO [Member] Aventiv Technologies, LLC Aventiv Technologies, LLC [Member] Aventiv Technologies, LLC 2028 Long-Term Debt, Maturity, Year Two (Increase) decrease in prepaid expenses Increase (Decrease) in Prepaid Expense Health Care Providers & Services Health Care Providers & Services Sector [Member] Health Care Providers & Services Sector NPH Property Holdings, LLC NPH Property Holdings, LLC [Member] NPH Property Holdings, LLC 8025 Baymeadows Circle Owner, LLC 8025 Baymeadows Circle Owner, LLC [Member] 8025 Baymeadows Circle Owner, LLC Offering costs from issuance of preferred stock (in dollars per share) Investment Company, Offering Costs from Issuance of Preferred Stock, Per Share Investment Company, Offering Costs from Issuance of Preferred Stock, Per Share Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Follow-On Investments (NPRC Common Stock, excluding cost of initial investment) Investment Owned, Follow-On Additions Investment Owned, Follow-On Additions Investment, basis spread, variable rate, TLA and TLD Investment, Basis Spread, Variable Rate, TLA and TLD Investment, Basis Spread, Variable Rate, TLA and TLD Gross Amounts of Financial Instruments Not Offset in Consolidated Statements of Assets and Liabilities Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Total increase (decrease) during period (in shares) Common Stock, Shares, Outstanding, Increase (Decrease) Common Stock, Shares, Outstanding, Increase (Decrease) Distributions in excess of earnings Retained Earnings [Member] Revolving Credit Facility Revolving Credit Facility [Member] Investment Valuation Fair Value Measurement, Policy [Policy Text Block] Net increase (decrease) from operations (in dollars per share) Investment Company, Investment Income (Loss) from Operations, Per Share October 15, 2025 – July 15, 2028 Debt Instrument Redemption Period Twenty Six [Member] Debt Instrument Redemption Period Twenty Six Common stock, shares outstanding (in shares) Beginning balance, Common stock, shares outstanding (in shares) Ending balance, Common stock, shares outstanding (in shares) Shares of common stock outstanding at end of year (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted (in dollars per share) Earnings (loss) per share - diluted (in dollars per share) Earnings Per Share, Diluted Total assets at fair value are in non-accrual status Fair Value, Investments, Non-Accrual Status of Total Assets Fair Value, Investments, Non-Accrual Status of Total Assets Total Interest Income Capitalized as PIK Interest Income Capitalized as PIK Interest Costs Capitalized 2029 Notes 2029 Notes [Member] 2029 Notes 7.50% Series M5 Preferred Stock Series M5 7.50% Series M5 Preferred Stock [Member] 7.50% Series M5 Preferred Stock Income incentive fee (Note 13) Income incentive fee Incentive Fee Expense Reimbursement of Legal, Tax, etc Reimbursement of Legal, Tax, etc Investment Company, Professional Fee Income Investment Company, Professional Fee Income Total interest income (excluding PIK interest income) Interest Income, Operating, Paid in Cash Sent to Portfolio Company Involved in Litigation Settlement Sent to Portfolio Company Involved in Litigation Settlement [Member] Sent to Portfolio Company Involved in Litigation Settlement Ownership [Domain] Ownership [Domain] Distributors Distributors Sector [Member] Distributors Sector Borrowings under Revolving Credit Facility (Note 4) Proceeds from Long-Term Lines of Credit Interest accrued at cash interest rate Interest Accrued at Cash Interest Rate Interest Accrued at Cash Interest Rate Schedule of Offsetting Assets Offsetting Assets [Table Text Block] Second Lien Debt Debt Securities, Second Lien [Member] Debt Securities, Second Lien Debt repayments and considerations from sales of equity securities Investments Owned, At Cost, Gross Reductions Investments Owned, At Cost, Gross Reductions Investment Advisory And Management Agreement Incentive Rate Quarterly Hurdle Rate Investment Advisory And Management Agreement Incentive Rate Quarterly Hurdle Rate [Member] Investment Advisory And Management Agreement Incentive Rate Quarterly Hurdle Rate Weighted average common shares from assumed conversion of Convertible Preferred Stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Debt Securities, First Lien 7 Debt Securities, First Lien7 [Member] Debt Securities, First Lien7 Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity O 2025 Q3 Dividends O 2025 Q3 Dividends [Member] O 2025 Q3 Dividends Common Equity/Interests/Warrants 9 Common Stock, Interests Or Warrants9 [Member] Common Stock, Interests Or Warrants9 Ownership interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest DRI Holding Inc. DRI Holding Inc. [Member] DRI Holding Inc. Net change in net unrealized losses Debt and Equity Securities, Net Change In Unrealized Gain (Loss) Debt and Equity Securities, Net Change In Unrealized Gain (Loss) Total return based on market value Investment Company, Total Return, Market Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Nixon, Inc. Nixon, Inc. [Member] Nixon, Inc. Over-Allotment Option Over-Allotment Option [Member] Increase (decrease) in interest payable Increase (Decrease) in Interest Payable, Net Schedule of Summarized Financial Information for NPRC Investment Company, Nonconsolidated Subsidiary, Summarized Financial Information [Table Text Block] Redemption price rate Temporary Equity, Redemption Price, Rate Temporary Equity, Redemption Price, Rate Gains (losses) on excluded components relating to forward points Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax 5.50% Series A2 Preferred Stock Series A2 5.50% Series A2 Preferred Stock [Member] 5.50% Series A2 Preferred Stock Investment, Issuer Name [Axis] Investment, Issuer Name [Axis] Stryker Energy, LLC Stryker Energy, LLC [Member] Stryker Energy, LLC RME Group Holding Company RME Group Holding Company [Member] RME Group Holding Company Halcyon Loan Advisors Funding 2014-2 Ltd. Halcyon Loan Advisors Funding 2014-2 Ltd. [Member] Halcyon Loan Advisors Funding 2014-2 Ltd. Value of shares issued through reinvestment of dividends Stock Issued Permanent differences Investment, Tax Basis Reconciliation, Permanent Differences, Increase (Decrease) In Taxable Income Investment, Tax Basis Reconciliation, Permanent Differences, Increase (Decrease) In Taxable Income Software Software Sector [Member] Software Sector Schedule of Maturities of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Title of Individual [Axis] Title and Position [Axis] Sale of Stock [Axis] Sale of Stock [Axis] Multi-Family Multifamily [Member] O 2025 Q1 Dividends O 2025 Q1 Dividends [Member] O 2025 Q1 Dividends KM2 Solutions LLC KM2 Solutions LLC [Member] KM2 Solutions LLC Restructured debt Investment Company, Recapitalization Equity Securities Converted Investment Company, Recapitalization Equity Securities Converted Gain (loss) recognized in Income Derivative, Gain (Loss) on Derivative, Net Auditor Firm ID Maturity Date Range Four Debt Instrument, Redemption, Period Four [Member] Schedule of Dividends Declared and Paid Dividends Declared [Table Text Block] NPRC Wolfchase LLC NPRC Wolfchase LLC [Member] NPRC Wolfchase LLC Debt Securities, First Lien 2 Debt Securities, First Lien2 [Member] Debt Securities, First Lien2 CP Energy Services Inc. CP Energy Services Inc. [Member] CP Energy Services Inc. Temporary equity, shares, exchanges (in shares) Exchanges (in shares) Temporary Equity, Shares, Exchanges Temporary Equity, Shares, Exchanges Temporary equity, early redemption fee, period after issuance Temporary Equity, Early Redemption Fee, Period After Issuance Temporary Equity, Early Redemption Fee, Period After Issuance NPRC Taylors LLC NPRC Taylors LLC [Member] NPRC Taylors LLC First Tower Holdings of Delaware LLC First Tower Holdings of Delaware LLC [Member] First Tower Holdings of Delaware LLC Related Party Transaction [Domain] Related Party Transaction [Domain] WatchGuard Technologies, Inc. WatchGuard Technologies, Inc. [Member] WatchGuard Technologies, Inc. 5.35% Series A Preferred Stock Series A 5.35% Series A Preferred Stock [Member] 5.35% Series A Preferred Stock Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Investments at fair value Fair Value Investment, fair value Fair value, beginning balance Fair value, ending balance Investment Owned, Fair Value Equity Equity Equity Securities [Member] NPRC Twin Oaks LLC NPRC Twin Oaks LLC [Member] NPRC Twin Oaks LLC NPRC and Subsidiaries NPRC and Subsidiaries [Member] NPRC and Subsidiaries Prospect Capital InterNotes® Prospect Capital InterNotes [Member] Prospect Capital InterNotes Debt Securities, First Lien 5 Debt Securities, First Lien5 [Member] Debt Securities, First Lien5 Allocation of overhead from Prospect Administration (Note 13) Allocation of overhead Administrative Fees Expense Common stock, shares issued (in shares) Common Stock, Shares, Issued 2024 Notes 2024 Notes [Member] 2024 Notes Survivor’s Option Survivor’s Option [Member] Survivor’s Option Fair value, beginning balance Fair value, ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value TP Kokomo, LLC TP Kokomo, LLC [Member] TP Kokomo, LLC Gain (loss) on Excluded Component Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net MITY-Lite, Inc. MITY-Lite, Inc. [Member] MITY-Lite, Inc. Class of Stock [Line Items] Class of Stock [Line Items] California CALIFORNIA Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Jackson Crosswinds LLC Jackson Crosswinds LLC [Member] Jackson Crosswinds LLC Termination Date Trading Arrangement Termination Date Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] USG Intermediate, LLC USG Intermediate, LLC [Member] USG Intermediate, LLC Accrued interest Debt Instrument, Increase, Accrued Interest Derivative assets: Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Maximum annualized dividend rate Temporary Equity, Maximum Annualized Dividend Rate Temporary Equity, Maximum Annualized Dividend Rate Series M5 6.50% Series M5 Preferred Stock [Member] 6.50% Series M5 Preferred Stock Entity Public Float Victor Holdings of Delaware, LLC Victor Holdings of Delaware, LLC [Member] Victor Holdings of Delaware, LLC Audit Information [Abstract] Audit Information Fair Value as of Grant Date Award Grant Date Fair Value Debt Securities, First Lien 11 Debt Securities, First Lien 11 [Member] Debt Securities, First Lien 11 Interest at Floating Rates Debt Securities, Floating Interest Rate [Member] Debt Securities, Floating Interest Rate Redemptions of Convertible Notes (Note 5) Repayments of convertible debt Repayments of Convertible Debt Redemption price rate Debt Instrument, Redemption Price, Percentage Capstone Logistics Acquisition, Inc. Capstone Logistics Acquisition, Inc. [Member] Capstone Logistics Acquisition, Inc. Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Stock repurchase program, remaining authorized repurchase amount Share Repurchase Program, Remaining Authorized, Amount January 15, 2026 – July 15, 2030 Debt Instrument Redemption Period Twenty Seven [Member] Debt Instrument Redemption Period Twenty Seven Redstone Holdco 2 LP Redstone Holdco 2 LP [Member] Redstone Holdco 2 LP Amount ($ per share), before pro ration for partial periods Temporary Equity, Dividends Per Share, Declared Temporary Equity, Dividends Per Share, Declared Arrangement Duration Trading Arrangement Duration Temporary equity, liquidation preference (usd per share) Temporary Equity, Liquidation Preference Per Share To Offset Current Period Allocations of Overhead Expense, Reimbursement Of Administration Expense To Offset Current Period Allocations of Overhead Expense, Reimbursement Of Administration Expense [Member] To Offset Current Period Allocations of Overhead Expense, Reimbursement Of Administration Expense Second Exchange Second Exchange [Member] Second Exchange Common stock, consecutive trading days, volume weighted average price Common Stock, Consecutive Trading Days, Volume Weighted Average Price Common Stock, Consecutive Trading Days, Volume Weighted Average Price Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Registrant Name Common Equity/Interests/Warrants 6 Common Stock, Interests Or Warrants6 [Member] Common Stock, Interests Or Warrants6 STG Distribution, LLC STG Distribution, LLC (f/k/a Reception Purchaser, LLC) [Member] STG Distribution, LLC (f/k/a Reception Purchaser, LLC) Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Apidos CLO XXII Apidos CLO XXII [Member] Apidos CLO XXII Gain (loss) on sale of equity investment Equity Method Investment, Realized Gain (Loss) on Disposal Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Series A Preferred Stock In July 2021 Series A Preferred Stock In July 2021 [Member] Series A Preferred Stock In July 2021 Total PIK Interest Income Interest Income, Operating, Paid in Kind Mountain View CLO IX Ltd. Mountain View CLO IX Ltd. [Member] Mountain View CLO IX Ltd. Filing Two Filing Two [Member] Filing Two NPRC Apex Holdings LLC NPRC Apex Holdings LLC [Member] NPRC Apex Holdings LLC First Lien Term Loan First Lien Term Loan [Member] First Lien Term Loan Beginning balance, temporary equity Ending balance, temporary equity Temporary Equity, Carrying Amount, Attributable to Parent Net change in unrealized (gains) losses from derivative instruments and foreign currency transactions Unrealized Gain (Loss), Derivative and Foreign Currency Transaction Price Change, Operating, before Tax Net realized (gains) losses on investments Investment, Tax Basis Reconciliation, Net Realized Gains (Losses) On Investments, Increase (Decrease) In Taxable Income Investment, Tax Basis Reconciliation, Net Realized Gains (Losses) On Investments, Increase (Decrease) In Taxable Income All Award Types Award Type [Domain] Term Loan A Term Loan A [Member] Term Loan A Revenue multiple Measurement Input, Revenue Multiple [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Share price (usd per share) Inception to Date Liquidation Preference Issued via Offering Temporary Equity, Liquidation Preference, Value, Inception to Date Temporary Equity, Liquidation Preference, Value, Inception to Date ShiftKey, LLC ShiftKey, LLC [Member] ShiftKey, LLC Geographical [Axis] Geographical [Axis] Increase (decrease) in accrued expenses Increase (Decrease) in Accrued Liabilities Derivative Instruments Summary of Derivative Instruments [Abstract] Uncommitted funds Investment Company, Financial Support to Investee Contractually Required, Amount Restricted cash Restricted Cash BCPE Osprey Buyer, Inc. BCPE Osprey Buyer, Inc. [Member] BCPE Osprey Buyer, Inc. O 2025 Q2 Dividends O 2025 Q2 Dividends [Member] O 2025 Q2 Dividends Investment, Issuer Affiliation [Axis] Investment, Issuer Affiliation [Axis] Faraday Buyer, LLC Faraday Buyer, LLC [Member] Faraday Buyer, LLC Shares issued through reinvestment of dividends (in shares) Shares issued through Preferred Stock DRIP (in shares) Temporary Equity, Shares, Dividend Reinvestment Plan Temporary Equity, Shares, Dividend Reinvestment Plan Legal Entity [Axis] Interest expense Interest Expense, Debt Prepayment premium for early repayment Early Repayment of Subordinated Debt Cash, Cash Equivalents and Restricted Cash at beginning of period Cash, Cash Equivalents and Restricted Cash at End of Period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Gross Amounts of Cash Collateral Received (Pledged) from Counterparty Not Offset in Consolidated Statements of Assets and Liabilities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Newly-Issued Series M5 Preferred Stock Newly-Issued Series M5 Preferred Stock [Member] Newly-Issued Series M5 Preferred Stock Health Care Providers & Services Health Care Providers and Services Sector [Member] Health Care Providers and Services Sector TPS, LLC TPS, LLC [Member] TPS, LLC Software fees incurred Software Fees Incurred Software Fees Incurred Investment company, distributable earnings (loss), accumulated capital loss carryforward Investment Company, Distributable Earnings (Loss), Accumulated Capital Loss Carryforward Non-NEOs Non-NEOs [Member] Triggering Event [Domain] Triggering Event [Domain] Triggering Event 5.50% Preferred Stock, 6.50% Preferred Stock 5.50% Preferred Stock, 6.50% Preferred Stock [Member] 5.50% Preferred Stock, 6.50% Preferred Stock Common Equity/Interests/Warrants 1 Common Stock, Interests Or Warrants1 [Member] Common Stock, Interests Or Warrants1 Equity ownership percentage Equity Method Investment, Ownership Percentage Series MM2 Series MM2 Preferred Stock [Member] Series MM2 Preferred Stock Repurchase of preferred stock Repurchase of Preferred Stock Temporary Equity, Repurchase of Preferred Stock Temporary Equity, Repurchase of Preferred Stock Subordinated Structured Notes Debt Securities, Subordinate Structured Notes [Member] Debt Securities, Subordinate Structured Notes CP Holdings of Delaware LLC CP Holdings of Delaware LLC [Member] CP Holdings of Delaware LLC Net Amounts Presented in the Consolidated Statement of Assets and Liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Investment, Name [Domain] Investment, Name [Domain] First Lien Note First Lien Note [Member] First Lien Note 2027 Long-Term Debt, Maturity, Year One Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Gross Reductions (Cost) Investments in and Advances to Affiliates, at Fair Value, Gross Reductions (Costs) Investments in and Advances to Affiliates, at Fair Value, Gross Reductions (Costs) Preferred Equity 2 Preferred Stock2 [Member] Preferred Stock2 Net proceeds of issuance of debt Proceeds From Issuance of Unsecured Debt, Net Proceeds From Issuance of Unsecured Debt, Net Statistical Measurement [Axis] Statistical Measurement [Axis] Base management fee rate Management and Service Fees, Base Rate Schedule of Changes in the Fair Values of Derivatives Designated as Fair Value hedges on Earnings and Reclassification of Derivatives Designated as Cash Flow Hedges into Earnings Derivative Instruments, Gain (Loss) [Table Text Block] Award Type Award Type [Axis] January 15, 2027 – July 15, 2029 Debt Instrument Redemption Period Fourteen [Member] Debt Instrument Redemption Period Fourteen Series AA2 Series AA2 Preferred Stock [Member] Series AA2 Preferred Stock Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Unrealized appreciation (depreciation), net Investment, Tax Basis, Unrealized Gain (Loss) Distributions in excess of earnings (Note 12) Distributable loss Retained Earnings (Accumulated Deficit) Wright Foster Disposals, LLC Wright Foster Disposals, LLC [Member] Wright Foster Disposals, LLC Trading days Debt Instrument, Convertible, Threshold Trading Days O 2026 Q1 Dividends O 2026 Q1 Dividends [Member] O 2026 Q1 Dividends Preferred Stock Preferred Stock Policy [Policy Text Block] Preferred Stock Policy Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Debt Securities, First Lien 12 Debt Securities, First Lien12 [Member] Debt Securities, First Lien12 Common Stock Common Stock [Member] Enseo Acquisition, Inc. Enseo Acquisition, Inc. [Member] Enseo Acquisition, Inc. Victor Technology, LLC Victor Technology, LLC [Member] Victor Technology, LLC Per Annual Redemption Period Per Annual Redemption Period [Member] Per Annual Redemption Period August 15, 2029 – December 15, 2034 Debt Instrument Redemption Period Nineteen [Member] Debt Instrument Redemption Period Nineteen Precisely Software Incorporated Precisely Software Incorporated [Member] Precisely Software Incorporated Common Equity/Interests/Warrants 2 Common Stock, Interests Or Warrants2 [Member] Common Stock, Interests Or Warrants2 Preferred Equity 3 Preferred Stock3 [Member] Preferred Stock3 Gain on repurchase of preferred stock Gain on Repurchase of Preferred Stock Gain on Repurchase of Preferred Stock Derivative Contract [Domain] Derivative Contract [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Liquidation value Temporary Equity, Liquidation Value Temporary Equity, Liquidation Value Increase (decrease) in due to broker Increase (Decrease) in Payable to Broker-Dealer and Clearing Organization Realized loss Realized Investment Gains (Losses) Employee Stock Option Share-Based Payment Arrangement, Option [Member] Equity rates of return Measurement Input, Equity Rates Of Return [Member] Measurement Input, Equity Rates Of Return Purchases of portfolio investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Related Party [Domain] Related and Nonrelated Parties [Domain] July 15, 2036 – February 15, 2037 Debt Instrument Redemption Period Twenty One [Member] Debt Instrument Redemption Period Twenty One Enterprise market & discounted cash flow approach and option pricing model Valuation, Enterprise Market & Discounted Cash Flow Approach And Option Pricing Model [Member] Valuation, Enterprise Market & Discounted Cash Flow Approach And Option Pricing Model Tabular List, Table Tabular List [Table Text Block] Paid-in capital in excess of par (Note 9 and 12) Additional Paid in Capital Debt Securities, First Lien 9 Debt Securities, First Lien9 [Member] Debt Securities, First Lien9 Debt Securities, First Lien 13 Debt Securities, First Lien 13 [Member] Debt Securities, First Lien 13 Series AA1, Series MM1, Series AA2, and Series MM2 Series AA1 and Series MM1, Series AA2, and Series MM2 [Member] Series AA1 and Series MM1, Series AA2, and Series MM2 Weighted average common shares from assumed conversion of convertible notes (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Vesper Statesboro, LLC Vesper Statesboro, LLC [Member] Vesper Statesboro, LLC Name Awards Close in Time to MNPI Disclosures, Individual Name Average outstanding balance Line of Credit Facility, Average Outstanding Amount Investment, Identifier [Axis] Investment, Identifier [Axis] Transfers within Level 3 Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers Within Level 3 Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers Within Level 3 CP Well CP Well [Member] CP Well Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Taco Bell, OK Taco Bell, OK [Member] Taco Bell, OK Market approach Valuation, Market Approach [Member] MITY FSC, Inc. MITY FSC, Inc. [Member] MITY FSC, Inc. Interest at Fixed Rates Debt Securities, Fixed Interest Rate [Member] Debt Securities, Fixed Interest Rate Prospect Administration LLC Prospect Administration LLC [Member] Prospect Administration LLC Conversion of preferred stock to common stock (in shares) Conversion of preferred stock to common stock (in shares) Temporary Equity, Shares, Conversion of Convertible Securities Temporary Equity, Shares, Conversion of Convertible Securities O 2026 Q2 Dividends O 2026 Q2 Dividends [Member] O 2026 Q2 Dividends Preferred Stock, par value $0.001 per share (766,678,529 and 836,490,792 shares of preferred stock authorized; 68,468,200 and 70,915,937 issued and outstanding, respectively) (Note 9) Preferred Stock, Value, Issued Series A Cumulative Non-Voting Preferred Stock Series A Cumulative Non-Voting Preferred Stock [Member] Series A Cumulative Non-Voting Preferred Stock Adjustment to Compensation: Adjustment to Compensation [Axis] (Increase) decrease in due from broker Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Maximum Offering Size (Shares) Temporary Equity, Maximum Offering Size Temporary Equity, Maximum Offering Size Interventional Management Services, LLC Interventional Management Services, LLC [Member] Interventional Management Services, LLC Credit Concentration Risk Credit Concentration Risk [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Credit.com Holdings, LLC Credit.com Holdings, LLC [Member] Credit.com Holdings, LLC Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Extinguishment of debt, amount Extinguishment of Debt, Amount Hedging Designation [Axis] Hedging Designation [Axis] O 2025 Q4 Dividends O 2025 Q4 Dividends [Member] O 2025 Q4 Dividends Schedule of Subsidiary of Limited Liability Company Schedule of Subsidiary of Limited Liability Company or Limited Partnership [Table Text Block] Schedule of Subsidiary of Limited Liability Company or Limited Partnership Credit Facility [Axis] Credit Facility [Axis] Jefferson Chase OH Partners, LLC Jefferson Chase OH Partners, LLC [Member] Jefferson Chase OH Partners, LLC Total Foreign currency forward contracts - Assets Assets, Fair Value Disclosure Consolidated revenue interest Consolidated Revenue, Interest Consolidated Revenue, Interest Series A3 6.50% Series A3 Preferred Stock [Member] 6.50% Series A3 Preferred Stock Name Measure Name Pay vs Performance Disclosure [Line Items] Royalty, net profit and revenue interests Royalty, Net Profit and Net Revenue Interests Royalty, Net Profit and Net Revenue Interests Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Discovery MSO Holdco, LLC. Discovery MSO Holdco, LLC. [Member] Discovery MSO Holdco, LLC. Debt Instrument [Line Items] Debt Instrument [Line Items] Lakeview Trail OH Partners, LLC Lakeview Trail OH Partners, LLC [Member] Lakeview Trail OH Partners, LLC Prospect Capital Funding LLC Prospect Capital Funding LLC [Member] Prospect Capital Funding LLC Paid-in capital in excess of par Additional Paid-in Capital [Member] Redemption eligibility term Temporary Equity, Redemption Eligibility Temporary Equity, Redemption Eligibility Series M4 6.50% Series M4 Preferred Stock [Member] 6.50% Series M4 Preferred Stock InterDent, Inc. InterDent, Inc. [Member] InterDent, Inc. First Lien Revolving Line of Credit Debt Securities, First Lien Revolving Line of Credit [Member] Debt Securities, First Lien Revolving Line of Credit New WPCC Parent, LLC New WPCC Parent, LLC [Member] New WPCC Parent, LLC Echelon Transportation, LLC Echelon Transportation, LLC [Member] Echelon Transportation, LLC Accrued expenses Accrued Liabilities InspereX LLC Dealer Manager Agreement InspereX LLC Dealer Manager Agreement [Member] InspereX LLC Dealer Manager Agreement Spartan Energy Holdings, Inc. Spartan Energy Holdings, Inc. [Member] Spartan Energy Holdings, Inc. Interest, net Interest Receivable Interest Receivable Name Trading Arrangement, Individual Name Cash and cash equivalents (restricted cash of $2,812 and $4,282, respectively) Cash and Cash Equivalent Commercial Commercial [Member] Commercial 9220 Old Lantern Way, LLC 9220 Old Lantern Way, LLC [Member] 9220 Old Lantern Way, LLC Net Realized and Net Change in Unrealized Gains (Losses) from Investments Debt and Equity Securities, Gain (Loss) Company Selected Measure Amount Company Selected Measure Amount Reclassification of preferred stock issuance costs (in dollars per share) Investment Company, Reclassification of Preferred Stock Issuance Costs, Per Share Investment Company, Reclassification of Preferred Stock Issuance Costs, Per Share Repurchase of preferred stock (in shares) Repurchase of preferred stock (in shares) Temporary Equity, Shares, Repurchase of Preferred Stock Temporary Equity, Shares, Repurchase of Preferred Stock Net realized (gains) losses from derivative instruments and foreign currency transactions Realized Gain (Loss), Derivative and Foreign Currency Transaction Price Change, Operating, before Tax Nationwide Loan Company LLC Nationwide Loan Company LLC [Member] Nationwide Loan Company LLC Net unrealized (gains) losses on investments Investment Company, Tax Basis, Unrealized (Gain) Loss, Not Currently (Taxable) Deductible Investment company, distributable earnings (loss), accumulated long-term capital gain (loss) Investment Company, Distributable Earnings (Loss), Accumulated Long-Term Capital Gain (Loss) 2031 Long-Term Debt, Maturity, Year Five Prime Rate Prime Rate [Member] Non-PEO NEO Non-PEO NEO [Member] Number of investments held Investment Company, Number Of Investments Held Investment Company, Number Of Investments Held Convertible Notes Convertible Notes Policy [Policy Text Block] Convertible Notes Policy First Exchange First Exchange [Member] First Exchange R-V Holdings of Delaware, LLC R-V Holdings of Delaware, LLC [Member] R-V Holdings of Delaware, LLC Royalty, net profit and revenue interests Residual Profit Interest, Other Income Residual Profit Interest, Other Income Safety Solutions Financing, LLC Safety Solutions Financing, LLC [Member] Safety Solutions Financing, LLC Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Award Timing Method Award Timing Method [Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] First Tower Finance Company LLC First Tower Finance Company LLC [Member] First Tower Finance Company LLC Reclassification of distributions from capital, increase (decrease) Investment Company, Tax Reclassification, Increase (Decrease) Currency Purchased Notional Amount to be Sold Derivative Liability, Notional Amount Shutterfly Finance, LLC Shutterfly Finance, LLC [Member] Shutterfly Finance, LLC Universal Turbine Parts, LLC Universal Turbine Parts, LLC [Member] Universal Turbine Parts, LLC Net Increase (Decrease) in Net Assets Resulting from Operations Net Increase (Decrease) in Net Assets Resulting from Operations Net increase (decrease) in net assets resulting from operations Net (loss) Net Income (Loss) Attributable to Parent SPCP Hampton LLC SPCP Hampton LLC [Member] SPCP Hampton LLC Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Investments Investments [Member] Broda Enterprises ULC Broda Enterprises ULC [Member] Broda Enterprises ULC Restatement Determination Date: Restatement Determination Date [Axis] Exchanged multiplied (usd per share) Preferred Stock, Dividends, Threshold Multiplied Preferred Stock, Dividends, Threshold Multiplied Litigation settlement Litigation Settlement, Amount Awarded to Other Party Threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Preferred Equity 1 Preferred Stock1 [Member] Preferred Stock1 Research Now Group, LLC and Dynata, LLC Research Now Group, LLC and Dynata, LLC [Member] Research Now Group, LLC and Dynata, LLC Investment Income Revenues [Abstract] Galaxy XXVII CLO, Ltd. Galaxy XXVII CLO, Ltd. [Member] Galaxy XXVII CLO, Ltd. National Property REIT Corp. NPRC National Property REIT Corp. [Member] National Property REIT Corp. Collateral posted Collateral Already Posted, Aggregate Fair Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Terraces at Perkins Rowe JV LLC Terraces at Perkins Rowe JV LLC [Member] Terraces at Perkins Rowe JV LLC Statistical Measurement [Domain] Statistical Measurement [Domain] Document Fiscal Year Focus Gross Amounts Offset in the Consolidated Statement of Assets and Liabilities Derivative Liability, Subject to Master Netting Arrangement, Asset Offset ProHaul Transports, LLC ProHaul Transports, LLC [Member] ProHaul Transports, LLC Option Pricing Model Valuation Technique, Option Pricing Model [Member] June 15, 2033 – July 15, 2033 Debt Instrument Redemption Period Twenty [Member] Debt Instrument Redemption Period Twenty Structuring and amendment fees Structuring Fee Advisory Fee Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Investment Advisory Agreement Investment Advisory Agreement [Member] Investment Advisory Agreement Debt Securities, First Lien 10 Debt Securities, First Lien10 [Member] Debt Securities, First Lien10 Accretion of discounts and premiums, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Accretion (Amortization) Of Discounts And Premiums, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Accretion (Amortization) Of Discounts And Premiums, Net Net realized (losses) gains on investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Realized Gains (Loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Realized Gains (Loss) Eyefive, LLC (d/b/a Shipoffers) Eyefive, LLC (d/b/a Shipoffers) [Member] Eyefive, LLC (d/b/a Shipoffers) Common stock, par value $0.001 per share (1,233,321,471 and 1,163,509,208 common shares authorized; 512,746,556 and 455,902,826 issued and outstanding, respectively) (Note 9) Common Stock, Value, Issued Mississippi MISSISSIPPI Schedule of Notes Outstanding Schedule of Long-Term Debt Instruments [Table Text Block] Ratios/Supplemental Data Ratios and Supplemental Data [Abstract] Ratios and Supplemental Data Return of Capital to common stockholders (in dollars per share) Investment Company, Return of Capital, Per Share Investment Company, Return of Capital, Per Share Investment Advisory And Management Agreement Incentive Rate Annual Catch Up Threshold Member Investment Advisory And Management Agreement Incentive Rate Annual Catch Up Threshold Member [Member] Investment Advisory And Management Agreement Incentive Rate Annual Catch Up Threshold Member Redemption limit, percent Temporary Equity, Redemption Limit, Percent Temporary Equity, Redemption Limit, Percent Credit Facility Line of Credit [Member] Restatement Determination Date Restatement Determination Date Cash collateral Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Series MM2 Series MM2 6.50% Series MM2 Preferred Stock [Member] 6.50% Series MM2 Preferred Stock Commercial Services & Supplies Commercial Services & Supplies Sector [Member] Commercial Services & Supplies Sector Non-control/non-affiliate investments Investment, Unaffiliated Issuer [Member] Jackson Pear Orchard LLC Jackson Pear Orchard LLC [Member] Jackson Pear Orchard LLC Redemption of Preferred Stock (in shares) Temporary Equity, Shares, Redemption of Preferred Stock, Shares Temporary Equity, Shares, Redemption of Preferred Stock, Shares Issuance of preferred stock (in shares) Shares Issued (in shares) Temporary Equity, Stock Issued During Period, Shares, New Issues Temporary Equity, Stock Issued During Period, Shares, New Issues Amendment Flag Proceeds from equity method investments Proceeds from Sale of Equity Method Investments Term Loan B Term Loan B [Member] Term Loan B Druid City Infusion, LLC Druid City Infusion, LLC [Member] Druid City Infusion, LLC Valley Electric Holdings I, Inc. Valley Electric Holdings I, Inc. [Member] Valley Electric Holdings I, Inc. Net Investment Income Net Investment Income Villages of Wildwood Holdings LLC Villages of Wildwood Holdings LLC [Member] Villages of Wildwood Holdings LLC Investment company, distributable earnings (loss), accumulated ordinary income (loss) Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss) All Other Industries All Other Industry Sectors [Member] All Other Industry Sectors Investments [Domain] Investments [Domain] Valuation Approach, Enterprise Value Waterfall Valuation Approach, Enterprise Value Waterfall [Member] Valuation Approach, Enterprise Value Waterfall Online Lending Online Lending Sector [Member] Online Lending Sector Increase (decrease) in due to Prospect Capital Management Increase (Decrease) in Management Fee Payable Non-current liabilities Liabilities, Noncurrent 2023 Notes 2023 Notes [Member] 2023 Notes Redemptions of Preferred Stock Payments for Redemption of Preferred Stock Payments for Redemption of Preferred Stock Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 LCM XIV Ltd. LCM XIV Ltd. [Member] LCM XIV Ltd. Entity Address, State or Province Aerospace & Defense Aerospace Sector [Member] PEO Total Compensation Amount PEO Total Compensation Amount Medical Solutions Holdings, Inc. Medical Solutions Holdings, Inc. [Member] Medical Solutions Holdings, Inc. O 2027 M4 Dividends O 2027 M4 Dividends [Member] O 2027 M4 Dividends Basic (in shares) Weighted average common shares outstanding - basic (in shares) Weighted average shares of common stock outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Asset coverage ratio on our senior security stock Investment Company, Senior Security, Stock, Asset Coverage Ratio Non-Cash Financing Activities Noncash Financing Items [Abstract] Noncash Financing Items Senior Living Senior Living [Member] Senior Living Number of assets transferred out of Level 2 to Level 3 Number of Assets Transferred Out Of Level 2 To Level 3 Number of Assets Transferred Out Of Level 2 To Level 3 Schedule of Investments [Abstract] Triggering Event [Axis] Triggering Event [Axis] Triggering Event Average cost per share, gross (usd per share) Shares Acquired, Average Cost Per Share, Gross Shares Acquired, Average Cost Per Share, Gross Investment Company, Nonconsolidated Subsidiary [Line Items] Investment Company, Nonconsolidated Subsidiary [Line Items] Town & Country Holdings, Inc. Town & Country Holdings, Inc. [Member] Town & Country Holdings, Inc. O 2026 Q4 Dividends O 2026 Q4 Dividends [Member] O 2026 Q4 Dividends (Increase) decrease in interest receivable, net Increase (Decrease) in Accrued Interest Receivable, Net Floating Rate Preferred Stock Holders Floating Rate Preferred Stock Holders [Member] Floating Rate Preferred Stock Holders Refuel Agency, Inc. Refuel Agency, Inc. [Member] Refuel Agency, Inc. Ordinary income Investment Company, Distribution, Ordinary Income ICFR Auditor Attestation Flag Other Income Other Income Policy [Policy Text Block] Other Income Policy Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Filing One Filing One [Member] Filing One Investments at Fair Value Investments, At Fair Value [Member] Investments, At Fair Value Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Debt issuance costs, gross Debt Issuance Costs, Gross 5224 Long Road Holdings, LLC 5224 Long Road Holdings, LLC [Member] 5224 Long Road Holdings, LLC Net Increase (Decrease) in Net Assets Resulting from Operations applicable to Common Stockholders Net increase (decrease) in net assets resulting from operations - basic Net Income (Loss) Available to Common Stockholders, Basic Interest rate Loans To Portfolio Companies, Interest Rate Loans To Portfolio Companies, Interest Rate Value of shares issued through reinvestment of dividends Stock Issued During Period, Value, Dividend Reinvestment Plan PeopleConnect Holdings, Inc PeopleConnect Holdings, Inc [Member] PeopleConnect Holdings, Inc Investments Held Benchmark Investments Held Benchmark [Member] Investments Held Benchmark Valley Electric Company, Inc. Valley Electric Company, Inc. [Member] Valley Electric Company, Inc. Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Machinery Machinery Sector [Member] Machinery Sector Portfolio Investments Schedule of Investments [Text Block] Purchase Price SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross Debt Securities, First Lien 8 Debt Securities, First Lien8 [Member] Debt Securities, First Lien8 Total Operating Expenses Gross profit Investment Income, Investment Expense Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Per Share Information Earnings Per Share, Policy [Policy Text Block] Ratio of operating expenses to average net assets applicable to common shares Investment Company, Expense Ratio before Incentive Allocation November 15, 2042 – March 15, 2052 Debt Instrument Redemption Period Twenty Five [Member] Debt Instrument Redemption Period Twenty Five Net of revenues Investment Owned, Percent of Net Revenues Investment Owned, Percent of Net Revenues Discovery Point Retreat, LLC Discovery Point Retreat, LLC [Member] Discovery Point Retreat, LLC Amortization of deferred financing costs Amortization of Debt Issuance Costs Unsecured Debt Unsecured Debt [Member] Common Equity/Interests/Warrants 3 Common Stock, Interests Or Warrants3 [Member] Common Stock, Interests Or Warrants3 Belnick, LLC (d/b/a The Ubique Group) Belnick, LLC (d/b/a The Ubique Group) [Member] Belnick, LLC (d/b/a The Ubique Group) (Increase) decrease in due from Affiliate Increase (Decrease) Due from Affiliates Long-term debt Net Carrying Value Long-Term Debt Value of shares issued through reinvestment of dividends (in shares) Value of shares issued through reinvestment of dividends (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan Debt Securities, Second Lien 5 Debt Securities, Second Lien 5 [Member] Debt Securities, Second Lien 5 Automobile Components Automobile Components Sector [Member] Automobile Components Sector Verify Diagnostics LLC Verify Diagnostics LLC [Member] Verify Diagnostics LLC Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Gross Amounts of Cash Collateral Received (Pledged) from Counterparty Not Offset in Consolidated Statements of Assets and Liabilities Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Conversion of Stock, Name [Domain] Conversion of Stock, Name [Domain] Earnings multiple Measurement Input, Earnings Multiple [Member] Measurement Input, Earnings Multiple Dividends and Distributions to Common Shareholders Dividends and Distributions to Common Shareholders Policy [Policy Text Block] Dividends and Distributions to Common Shareholders Policy Beginning balance, Preferred Stock Classified as Temporary Equity (in shares) Ending balance, Preferred Stock Classified as Temporary Equity (in shares) Temporary equity, shares outstanding (in shares) Preferred Stock Outstanding (in shares) Temporary Equity, Shares Outstanding Security Exchange Name In Accordance With Survivor’s Option In Accordance With Survivor’s Option [Member] In Accordance With Survivor’s Option Diversified Consumer Services Diversified Consumer Services Sector [Member] Diversified Consumer Services Sector Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] O 2027 Q1 Dividends O 2027 Q1 Dividends [Member] O 2027 Q1 Dividends Spartan Term Loans Spartan Term Loans [Member] Spartan Term Loans O 2026 M9 Dividends O 2026 M9 Dividends [Member] O 2026 M9 Dividends Specialty Retail Specialty Retail Sector [Member] Specialty Retail Sector Total Foreign currency forward contracts - Liabilities Liabilities, Fair Value Disclosure Hotels, Restaurants & Leisure Hotels, Restaurants & Leisure Sector [Member] Hotels, Restaurants & Leisure Sector Total increase (decrease) during period Stockholders' Equity, Period Increase (Decrease) Directors’ fees Director Fee Segment Reporting Segment Reporting, Policy [Policy Text Block] Valley Electric Holdings II, Inc. Valley Electric Holdings II, Inc. [Member] Valley Electric Holdings II, Inc. Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Schedule of Weighted Average Number of Shares Schedule of Weighted Average Number of Shares [Table Text Block] Borda Canada Borda Canada [Member] Borda Canada National Property REIT Corp, Real Estate National Property REIT Corp, Real Estate [Member] National Property REIT Corp, Real Estate Geographical [Domain] Geographical [Domain] O 2025 M1 Dividends O 2025 M1 Dividends [Member] O 2025 M1 Dividends Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Investment Advisory And Management Agreement Incentive Rate Pre Incentive Fee Net Investment Income Below Catch Up Threshold Investment Advisory And Management Agreement Incentive Rate Pre Incentive Fee Net Investment Income Below Catch Up Threshold [Member] Investment Advisory And Management Agreement Incentive Rate Pre Incentive Fee Net Investment Income Below Catch Up Threshold Schedule of Investments [Table] Schedule of Investments [Table] BCPE North Star US Holdco 2, Inc. BCPE North Star US Holdco 2, Inc. [Member] BCPE North Star US Holdco 2, Inc. 150 Steeplechase Way Owner, LLC 150 Steeplechase Way Owner, LLC [Member] 150 Steeplechase Way Owner, LLC RGIS Services, LLC RGIS Services, LLC [Member] RGIS Services, LLC Unrealized losses Investment, Tax Basis, Unrealized Loss Belnick, LLC (d/b/a The Ubique Group) Belnick, LLC Belnick, LLC [Member] Belnick, LLC Recovery Solutions Parent, LLC Recovery Solutions Parent, LLC [Member] Recovery Solutions Parent, LLC Net increase (decrease) in preferred dividend accrual Temporary Equity, Net Decrease In Preferred Dividend Accrual Temporary Equity, Net Decrease In Preferred Dividend Accrual Maximum Aggregate Liquidation Preference of Offering Temporary Equity, Liquidation Preference Outstanding amount Principal Amount Principal Outstanding Total Long-Term Debt, Gross Asset Class [Domain] Asset Class [Domain] Related Party Transactions [Abstract] Shares issued (in shares) Shares, Issued Compensation Amount Outstanding Recovery Compensation Amount Ownership interest disposed percent Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Disposed Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Disposed Individual: Individual [Axis] Diluted (in shares) Weighted average shares of common stock outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Net increase (decrease) from operations applicable to common stockholders (in dollars per share) Investment Company, Investment Income (Loss) from Operations Net of Distributions to Preferred Stockholders, Per Share Investment Company, Investment Income (Loss) from Operations Net of Distributions to Preferred Stockholders, Per Share Entity Emerging Growth Company Related Party Transaction [Line Items] Related Party Transaction [Line Items] Derivative Instruments Derivatives, Policy [Policy Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Risks Relating to Our Operation as a Business Development Company [Member] Risks Relating to Our Operation as a Business Development Company Per Calendar Month Per Calendar Month [Member] Per Calendar Month K&N HoldCo, LLC K&N HoldCo, LLC [Member] K&N HoldCo, LLC Prepaid expenses Prepaid Expense Gross Amounts of Recognized Assets (Liabilities) Derivative Liability, Subject to Master Netting Arrangement, before Offset Common Equity/Interests/Warrants 7 Common Stock, Interests Or Warrants7 [Member] Common Stock, Interests Or Warrants7 Preferred Capital Securities, LLC Dealer Manager Agreement Preferred Capital Securities, LLC Dealer Manager Agreement [Member] Preferred Capital Securities, LLC Dealer Manager Agreement Other Other Receivables Other Receivables Other Receivables Other Receivables Net change in unrealized (losses) gains Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Unrealized Gains (Losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Unrealized Gains (Losses) Proceeds from issuance of preferred stock, net of underwriting costs Proceeds from Issuance of Redeemable Preferred Stock Redemptions of notes, net Repayments of unsecured debt Repayments of Unsecured Debt Issuances of notes, net of original issue discount Proceeds from issuance of discounts and offering costs Principal Amount Proceeds from Issuance of Unsecured Debt O 2025 M3 Dividends O 2025 M3 Dividends [Member] O 2025 M3 Dividends Debt Securities, First Lien 4 Debt Securities, First Lien4 [Member] Debt Securities, First Lien4 Investment Company, Net Assets [Roll Forward] Investment Company, Net Assets [Roll Forward] Organization, Consolidation and Presentation of Financial Statements [Abstract] Emerge Intermediate, Inc Emerge Intermediate, Inc [Member] Emerge Intermediate, Inc Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Vesper College Station, LLC Vesper College Station, LLC [Member] Vesper College Station, LLC Currency Sold Notional Amount to be Purchased Derivative Asset, Notional Amount Terminal Cap Rate Measurement Input, Cap Rate [Member] Investment Company, Financial Highlights [Line Items] Investment Company, Financial Highlights [Line Items] Ratio of net investment income to average net assets applicable to common shares Investment Company, Investment Income (Loss) Ratio Preferred equity ownership interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Preferred Equity Ownership Interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Preferred Equity Ownership Interest Atlantis Health Care Group (Puerto Rico), Inc. Atlantis Health Care Group (Puerto Rico), Inc. [Member] Atlantis Health Care Group (Puerto Rico), Inc. All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Principal payments under Revolving Credit Facility (Note 4) Repayments of Long-Term Lines of Credit First Lien Term B First Lien Term B [Member] First Lien Term B Schedule of Subsidiary of Limited Liability Company or Limited Partnership [Table] Subsidiary of LLC or LP [Table] Diversified Telecommunication Services Diversified Telecommunication Services Sector [Member] Diversified Telecommunication Services Sector Investment owned, discount (premium) Investment Owned, Discount (Premium) Investment Owned, Discount (Premium) Credit Central of Tennessee, LLC Credit Central of Tennessee, LLC [Member] Credit Central of Tennessee, LLC IT Services IT Services Sector [Member] IT Services Sector Rising Tide Holdings, Inc. Rising Tide Holdings, Inc. [Member] Rising Tide Holdings, Inc. Elliot Apartments Norcross, LLC Elliot Apartments Norcross, LLC [Member] Elliot Apartments Norcross, LLC Asset coverage ratio Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio Collateralized financings Collateralized Financings Credit Central South, LLC Credit Central South, LLC [Member] Credit Central South, LLC Vessel Company II, LLC Vessel Company II, LLC [Member] Vessel Company II, LLC Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Issuable Upon Conversion Issuable Upon Conversion [Member] Issuable Upon Conversion Debt Disclosure [Abstract] Investment Company, Nonconsolidated Subsidiary [Domain] Investment Company, Nonconsolidated Subsidiary [Domain] 5.50% Series MM1 Preferred Stock Series MM1 5.50% Series MM1 Preferred Stock [Member] 5.50% Series MM1 Preferred Stock Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Auditor Name More Than 35% and An Amount Less Than or Equal to 60% Credit Facility, Usage, More Than 35% and An Amount Less Than or Equal to 60% [Member] Credit Facility, Usage, More Than 35% and An Amount Less Than or Equal to 60% Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Nexus Buyer LLC Nexus Buyer LLC [Member] Nexus Buyer LLC Net realized gains (losses) from derivative instruments and foreign currency transactions Realized Gain (Loss), Foreign Currency Transaction And Derivatives, after Tax Realized Gain (Loss), Foreign Currency Transaction And Derivatives, after Tax Liabilities  Liabilities [Abstract] Debt Securities, First Lien 3 Debt Securities, First Lien3 [Member] Debt Securities, First Lien3 Effect of foreign currency exchange rates Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Weighted-average shares of common stock outstanding (Note 11) Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Student Housing Student Housing [Member] Student Housing Per Fiscal Quarter Per Fiscal Quarter [Member] Per Fiscal Quarter Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Other liabilities Other Liabilities Amount Distributed Dividends, Common Stock Common Equity/Interests/Warrants 8 Common Stock, Interests Or Warrants8 [Member] Common Stock, Interests Or Warrants8 Common stock, shares authorized (in shares) Common Stock, Shares Authorized Financing Receivable Name [Axis] Financing Receivable Name [Axis] Financing Receivable Name Per Share Data(10) Investment Company, Per Share Data [Abstract] Investment Company, Per Share Data Schedule of Carrying Values and Estimated Fair Values of Debt Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Exercise Price Award Exercise Price PIK Rate - Capitalized Investment, Interest Rate, Paid in Kind Capitalized Investment, Interest Rate, Paid in Kind Capitalized Stock repurchase program, authorized amount Share Repurchase Program, Authorized, Amount 5.35% Preferred Stock 5.35% Preferred Stock [Member] 5.35% Preferred Stock OneTouchPoint Corp OneTouchPoint Corp [Member] OneTouchPoint Corp Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Senior Subordinated Notes Senior Subordinated Notes [Member] 2026 Notes 2026 Notes [Member] 2026 Notes VTI Acquisition, Inc VTI Acquisition, Inc [Member] VTI Acquisition, Inc Unobservable Input Investment Company, Investment Owned, Measurement Input Investments, cost Investment , cost Cost Investment Owned, Cost Gross Additions (Cost) Investments in and Advances to Affiliates, at Fair Value, Gross Additions Interest payable Interest Payable Repayments of long-term debt Repayments of Long-Term Debt Involuntary Liquidating Preference per Unit (in dollars per unit) Preferred stock, liquidation preference (usd per share) Base management fee (Note 13) Base management fee Management Fee Expense Incentive fee expense, capital-gain-based Incentive Fee Expense, Capital-Gain-Based Unamortized discount and debt issuance costs Unamortized debt issuance Unamortized Discount & Debt Issuance Costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Dilutive impacted from conversion, less than (in dollars per share) Dilutive Impacted From Conversion Dilutive Impacted From Conversion Financial Highlights Investment Company, Financial Highlights [Text Block] (Increase) decrease in other receivables Increase (Decrease) in Other Receivables Imperative Worldwide, LLC Imperative Worldwide, LLC [Member] Imperative Worldwide, LLC 2017 Notes 2017 Notes [Member] 2017 Notes Equity Component [Domain] Equity Component [Domain] Measurement Input Type [Domain] Measurement Input Type [Domain] Payments for purchases of investments Payment for Purchase, Investment, Operating Activity Personal Care Products Personal Care Products Sector [Member] Personal Care Products Sector To Offset Current Period Allocations of Overhead Expense Prospect Administration To Offset Current Period Allocations of Overhead Expense, Prospect Administration [Member] To Offset Current Period Allocations of Overhead Expense, Prospect Administration Unfunded commitments Debt Securities, Unfunded Commitments [Member] Debt Securities, Unfunded Commitments Galaxy XV CLO, Ltd. Galaxy XV CLO, Ltd. [Member] Galaxy XV CLO, Ltd. Accumulated Realized Losses Accumulated Realized Losses [Member] Accumulated Realized Losses Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Due to broker Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization Scenario, Plan Scenario, Plan [Member] Food Products Food Products Sector [Member] Food Products Sector Net gain (loss) on redemptions of Preferred Stock Net (Loss) Gain On Redemptions Of Preferred Stock Net (Loss) Gain On Redemptions Of Preferred Stock Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount 3.437% 2028 Notes 3.437 2028 Notes [Member] 3.437 2028 Notes Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] % of Net Assets Derivative, Net Assets, Percentage Total interest income (Note 2) Interest Income Interest Income Interest Income, Operating Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] 7.50% Preferred Stock 7.50% Preferred Stock [Member] 7.50% Preferred Stock Schedule of Average Rate and Outstanding Balance Schedule of Line of Credit Facilities [Table Text Block] Stock repurchase program, number of shares authorized to be repurchased (in shares) Share Repurchase Program, Authorized, Number of Shares 23741 Pond Road Owner, LLC 23741 Pond Road Owner, LLC [Member] 23741 Pond Road Owner, LLC Schedule Issued Notes Schedule of Debt Issued [Table Text Block] Schedule of Debt Issued Risks Relating to Our Securities [Member] Risks Relating to Our Securities Authorized and unissued shares of common stock reclassified into shares of preferred stock (in shares) Common Shares Converted Into Preferred Stock, Shares Subscribed but Unissued Common Shares Converted Into Preferred Stock, Shares Subscribed but Unissued Litigation Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] O 2026 M7 Dividends O 2026 M7 Dividends [Member] O 2026 M7 Dividends United Sporting Companies, Inc. United Sporting Companies, Inc. [Member] United Sporting Companies, Inc. NPRC Lancaster LLC NPRC Lancaster LLC [Member] NPRC Lancaster LLC Weighted Average Weighted Average [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Name of Property [Domain] Name of Property [Domain] Preferred stock, liquidation value Preferred Stock, Liquidation Preference, Value Orlando 442 Owner, LLC (West Vue Apartments) Orlando 442 Owner, LLC (West Vue Apartments) [Member] Orlando 442 Owner, LLC (West Vue Apartments) Federal and State Income Taxes and Taxable Subsidiaries Income Tax, Policy [Policy Text Block] Net Cash Provided by Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Series AA1 Series AA1 Preferred Stock [Member] Series AA1 Preferred Stock Fully diluted ownership interest Fully Diluted, Ownership Fully Diluted, Ownership Total increase (decrease) Temporary Equity, Carrying Amount, Period Increase (Decrease) Income Statement [Abstract] Document Transition Report Bel Canto NPRC Parcstone LLC Bel Canto NPRC Parcstone LLC [Member] Bel Canto NPRC Parcstone LLC Operating Expenses Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Unrealized gains Investment, Tax Basis, Unrealized Gain Basis spread rate Investment, Basis Spread, Variable Rate City Area Code Geographic Concentration Risk Geographic Concentration Risk [Member] Document Information [Table] Subsequent Events Subsequent Events [Text Block] Expected volatility Measurement Input, Price Volatility [Member] Name Forgone Recovery, Individual Name Number of additional assets transferred out of Level 3 to Level 2 Number of Additional Assets Transferred Out Of Level 3 To Level 2 Number of Additional Assets Transferred Out Of Level 3 To Level 2 Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Interactive Media & Services Interactive Media & Services Sector [Member] Interactive Media & Services Sector Entity [Domain] Per share market value at end of year (in dollars per share) Investment Company, Market Value, Per Share Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Health Care Technology Health Care Technology Sector [Member] Health Care Technology Sector Conversion of preferred stock to common stock Conversion of Stock, Amount Converted Calculated interest basis, days Calculated Interest Basis, Days Calculated Interest Basis, Days LGC US FINCO, LLC LGC US FINCO, LLC [Member] LGC US FINCO, LLC Repurchase of Preferred Stock Payments for Repurchase of Preferred Stock and Preference Stock Shares issued (in shares) Stock Issued During Period, Shares, New Issues 8th Avenue Food & Provisions, Inc. 8th Avenue Food & Provisions, Inc. [Member] 8th Avenue Food & Provisions, Inc. Principal amount Investment Owned, Balance, Principal Amount Preferred stock, conversion ratio Preferred Stock, Convertible, Conversion Ratio November 15, 2032 – November 15, 2043 Debt Instrument Redemption Period Twenty Three [Member] Debt Instrument Redemption Period Twenty Three Gross Amounts Offset in the Consolidated Statement of Assets and Liabilities Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Cost basis of investments for tax purposes Investment, Tax Basis, Cost Yatesville Coal Company, LLC Yatesville Coal Company, LLC [Member] Yatesville Coal Company, LLC Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Series AA2 Series AA2 6.50% Series AA2 Preferred Stock [Member] 6.50% Series AA2 Preferred Stock Falling Creek Holdings LLC Falling Creek Holdings LLC [Member] Falling Creek Holdings LLC Schedule of Reconciliation of Net Increase in Net Assets Resulting from Operations to Taxable Income Federal Income Tax Note [Table Text Block] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Revision of Prior Period [Domain] Revision of Prior Period [Domain] Lorring Owner LLC Lorring Owner LLC [Member] Lorring Owner LLC Series A Preferred Stock Series A Preferred Stock [Member] Investment Company [Abstract] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Unobservable Inputs Used in Fair Value Measurement of Level 3 Investments Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Schedule of Other Income Other Income [Table Text Block] Other Income Revenue Recognition Revenue Recognition, Interest [Policy Text Block] Entity Current Reporting Status Net Cash Used in Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Control investments Investment, Affiliated Issuer, Controlled [Member] Total Shareholder Return Amount Total Shareholder Return Amount 2019 Notes 2019 Notes [Member] 2019 Notes 6.50% Preferred Stock 6.50% Preferred Stock [Member] 6.50% Preferred Stock Forward Contracts designated as cash flow hedging instruments Cash Flow Hedging [Member] Structured credit securities Structured Credit Securities [Member] Structured Credit Securities Air Freight & Logistics Air Freight & Logistics Sector [Member] Air Freight & Logistics Sector Total return based on net asset value Investment Company, Total Return Series MM1 Series MM1 Preferred Stock [Member] Series MM1 Preferred Stock Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Repurchase of Public Notes (Note 6) Repayments Of Public Debt Repayments Of Public Debt Barracuda Parent, LLC Barracuda Parent, LLC [Member] Barracuda Parent, LLC Structuring fees Other Income, Structuring Fees Other Income, Structuring Fees Total distributions paid to common stockholders Investment Company, Dividend Distribution And Tax Return Of Capital Distribution Investment Company, Dividend Distribution And Tax Return Of Capital Distribution 3.364% 2026 Notes 3.364 2026 Notes [Member] 3.364 2026 Notes Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] 2029 Long-Term Debt, Maturity, Year Three Temporary equity, par value (usd per share) Temporary Equity, Par or Stated Value Per Share 2022 Notes 2022 Notes [Member] 2022 Notes Asset recovery analysis Valuation Technique, Asset Recovery Analysis [Member] Valuation Technique, Asset Recovery Analysis Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Maturity Date Range Three Debt Instrument, Redemption, Period Three [Member] Total increase (decrease) (in shares) Temporary Equity, Carrying Amount, Period Increase (Decrease), Shares Temporary Equity, Carrying Amount, Period Increase (Decrease), Shares Debt Repayment Condition [Domain] Debt Repayment Condition [Domain] Debt Repayment Condition [Domain] Unused capacity fee rate Line of Credit Facility, Unused Capacity, Commitment Fee Percentage General Risk Factors [Member] General Risk Factors Financial Instruments [Domain] Financial Instruments [Domain] Overallotment purchase option term Overallotment Purchase Option Term Overallotment Purchase Option Term Other comprehensive income (loss): Other Comprehensive Income (Loss), Tax [Abstract] Schedule of Senior Securities Credit Central Holdings of Delaware, LLC Credit Central Holdings of Delaware, LLC [Member] Credit Central Holdings of Delaware, LLC Reimbursement of Administration Expenses (Note 13) Investment Company, Expense Offset Arrangement Total other income (Note 10) Other Income Total Other Income Total Other Income Other Income Derivative Assets, at fair value (Note 6) Derivative Asset Fair Value Gross Fair Value of Recognized Assets Derivative Asset Debt Securities, Second Lien 4 Debt Securities, Second Lien 4 [Member] Debt Securities, Second Lien 4 Net realized and unrealized (losses) gains Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Underlying Securities Award Underlying Securities Amount Nationwide Loan Company LLC Nationwide Acceptance Holdings LLC [Member] Nationwide Acceptance Holdings LLC Equity Real Estate Investment Trusts (REITs) Real Estate Sector [Member] Schedule of Financial Highlights Investment Company, Financial Highlights [Table Text Block] Residential Real Estate Investment Trusts (REITs) Equity Real Estate Investment Trusts (REITs) Sector [Member] Equity Real Estate Investment Trusts (REITs) Sector Wright Trucking, Inc. Wright Trucking, Inc. [Member] Wright Trucking, Inc. Preferred Stock Preferred Stock [Member] Valley Electric Co. of Mt. Vernon, Inc. Valley Electric Co. of Mt. Vernon, Inc. [Member] Valley Electric Co. of Mt. Vernon, Inc. Spartan Energy Services, LLC Spartan Energy Services, LLC [Member] Spartan Energy Services, LLC Inception to Date Preferred Shares Sold via Offering Temporary Equity, Shares Issued Inception to Date Temporary Equity, Shares Issued Inception to Date Newly-Issued Series M4 Preferred Stock Newly-Issued Series M4 Preferred Stock [Member] Newly-Issued Series M4 Preferred Stock O 2026 M1 Dividends O 2026 M1 Dividends [Member] O 2026 M1 Dividends Equity securities ownership Equity Securities Ownership Rate Equity Securities Ownership Rate Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] O 2025 M7 Dividends O 2025 M7 Dividends [Member] O 2025 M7 Dividends Net Reductions to Subordinated Structured Notes and related investment cost Net Reductions to Subordinated Structured Notes and Related Investment Cost Net Reductions to Subordinated Structured Notes and Related Investment Cost R-V Industries, Inc. R-V Industries, Inc. [Member] R-V Industries, Inc. Total Investments Concentration Risk Total Investments Concentration Risk [Member] Total Investments Concentration Risk Additions Investment Company, Additional Investment Investment Company, Additional Investment Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Gain (loss) on derivatives designated as cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Mortgage Outstanding SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Current Fiscal Year End Date O 2026 M3 Dividends O 2026 M3 Dividends [Member] O 2026 M3 Dividends Units (in shares) Investment Owned, Balance, Shares Vessel Company, LLC Vessel Company, LLC [Member] Vessel Company, LLC Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Series A Preferred Stock ATM Program Series A Preferred Stock ATM Program [Member] Series A Preferred Stock ATM Program Net Realized and Net Change in Unrealized Gains (Losses) from Investments Net Realized and Net Change in Unrealized Gains (Losses) from Investments [Abstract] Net Realized and Net Change in Unrealized Gains (Losses) from Investments Net Amounts Presented in the Consolidated Statement of Assets and Liabilities Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Issuance of preferred stock Temporary Equity, Stock Issued During Period, Value, New Issues Stock repurchased during period (in shares) Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Amount ($ per share), common stock (usd per share) Common Stock, Dividends, Per Share, Declared Entity File Number O 2025 M5 Dividends O 2025 M5 Dividends [Member] O 2025 M5 Dividends Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Victor Holdings Victor Holdings [Member] Victor Holdings Redemptions/Repurchases (in shares) Temporary Equity, Shares, Converted To Common and Repurchased Temporary Equity, Shares, Converted To Common and Repurchased Measure: Measure [Axis] Second Lien Revolving Line of Credit Debt Securities, Second Lien Revolving Line of Credit [Member] Debt Securities, Second Lien Revolving Line of Credit Accretion of original issue discount Amortization of Debt Discount (Premium) Investment Advisory And Management Agreement Incentive Rate Annual Hurdle Rate Investment Advisory And Management Agreement Incentive Rate Annual Hurdle Rate [Member] Investment Advisory And Management Agreement Incentive Rate Annual Hurdle Rate Credit Facility, Usage [Axis] Credit Facility, Usage [Axis] Credit Facility, Usage (Increase) decrease in due from Prospect Administration Increase (Decrease) Due from Other Related Parties Kickapoo Ranch Pet Resort Kickapoo Ranch Pet Resort [Member] Kickapoo Ranch Pet Resort Tangible book value multiple Measurement Input, Tangible Book Value Multiple [Member] Measurement Input, Tangible Book Value Multiple Net Increase (Decrease) in Net Assets and Temporary Equity Resulting from Operations: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest [Abstract] Receivables for: Receivable [Abstract] Receivable Leisure Products Leisure Products Sector [Member] Leisure Products Sector Equity Components [Axis] Equity Components [Axis] Related Party Related Party [Member] Jackson Lakeshore Landing LLC Jackson Lakeshore Landing LLC [Member] Jackson Lakeshore Landing LLC Series M2 Series M2 Preferred Stock [Member] Series M2 Preferred Stock Stock Conversion Description [Axis] Stock Conversion Description [Axis] Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Southport Owner LLC (Southport Crossing) Southport Owner LLC (Southport Crossing) [Member] Southport Owner LLC (Southport Crossing) Conversion of preferred stock to common stock Conversion Of Convertible Preferred Stock [Member] Conversion Of Convertible Preferred Stock Unamortized Discount & Debt Issuance Costs Debt Issuance Costs, Line of Credit Arrangements, Net Entity Small Business 1st Lien Term Loan Debt Securities, 1st Lien Term Loan [Member] Debt Securities, 1st Lien Term Loan Collections Acquisition Company, Inc. Collections Acquisition Company, Inc. [Member] Collections Acquisition Company, Inc. Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unamortized discount Debt Instrument, Unamortized Discount Number of assets transferred out of Level 3 to Level 2 Number of Assets Transferred Out Of Level 3 To Level 2 Number of Assets Transferred Out Of Level 3 To Level 2 TP Pueblo, LLC TP Pueblo, LLC [Member] TP Pueblo, LLC Enterprise market and discounted cash flow approach Valuation, Enterprise Market and Discounted Cash Flow Approach [Member] Valuation, Enterprise Market and Discounted Cash Flow Approach Public Notes Public Notes [Member] Public Notes MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Foster Testing Co., Inc. Foster Testing Co., Inc. [Member] Foster Testing Co., Inc. Proceeds from sale of investments and collection of investment principal Proceeds from Disposition of Investment, Operating Activity January 15, 2031 – April 15, 2031 Debt Instrument Redemption Period Twenty Two [Member] Debt Instrument Redemption Period Twenty Two USES Corp. USES Corp. [Member] USES Corp. Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Net realized gains (losses) on extinguishment of debt Net realized (gains) losses on extinguishment of debt Net gain (loss) on extinguishment of debt Gain (Loss) on Extinguishment of Debt Net Asset Value Per Common Share (Note 16)  (in dollars per share) Net asset value per common share at beginning of year (in dollars per share) Net asset value per common share at end of year (in dollars per share) Significant Accounting Policies Significant Accounting Policies [Text Block] 5.50% Preferred Stock DRIP 5.50% Preferred Stock DRIP [Member] 5.50% Preferred Stock DRIP Maximum Current PIK Rate Investment, Interest Rate, Paid in Kind Investment, Interest Rate, Paid in Kind 2020 Notes 2020 Notes [Member] 2020 Notes PlayPower, Inc. PlayPower, Inc. [Member] PlayPower, Inc. Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Transactions with Controlled Companies Additional Financial Information Disclosure [Text Block] Temporary equity, shares authorized (in shares) Shares Authorized (in shares) Temporary Equity, Shares Authorized Upstream Newco, Inc. Upstream Newco, Inc. [Member] Upstream Newco, Inc. TCSPV Holdings IV, LLC TCSPV Holdings IV, LLC [Member] TCSPV Holdings IV, LLC HarbourView CLO VII-R, Ltd. HarbourView CLO VII-R, Ltd. [Member] HarbourView CLO VII-R, Ltd. 6.50% Preferred Stock DRIP 6.50% Preferred Stock DRIP [Member] 6.50% Preferred Stock DRIP Change in operating assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Help/Systems Holdings, Inc. (d/b/a Forta, LLC) Help/Systems Holdings, Inc. [Member] Help/Systems Holdings, Inc. Distributions of net investment income (in dollars per share) Investment Company, Distribution of Net Investment Income to Shareholders, Per Share Investment Company, Distribution of Net Investment Income to Shareholders, Per Share Commitments and Contingencies (Note 3 and Note 15) Commitments and Contingencies Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Construction & Engineering Construction & Engineering Sector [Member] Construction & Engineering Sector Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Voya CLO 2012-4, Ltd. Voya CLO 2012-4, Ltd. [Member] Voya CLO 2012-4, Ltd. Distributions from earnings Investment Company, Dividend Distribution Executive Category: Executive Category [Axis] Vessel Company III, LLC Vessel Company III, LLC [Member] Vessel Company III, LLC Druid Hills Holdings LLC Druid Hills Holdings LLC [Member] Druid Hills Holdings LLC O 2026 M2 Dividends O 2026 M2 Dividends [Member] O 2026 M2 Dividends Counterparty Name [Axis] Counterparty Name [Axis] Financing Receivable Name [Domain] Financing Receivable Name [Domain] Financing Receivable Name [Domain] With Weighted Average Interest Rate With Weighted Average Interest Rate [Member] With Weighted Average Interest Rate Proceeds from settlement of forward contract Proceeds From Settlement Of Forward Contract Proceeds From Settlement Of Forward Contract O 2026 M11 Dividends O 2026 M11 Dividends [Member] O 2026 M11 Dividends Other Income Other Income [Text Block] Other Income Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Supplemental Disclosures Supplemental Cash Flow Information [Abstract] Reclassification adjustments included in interest expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax January 15, 2028 – June 15, 2033 Debt Instrument Redemption Period Seventeen [Member] Debt Instrument Redemption Period Seventeen PEO Name PEO Name Preferred stock issued (in shares) Preferred Stock Issued (in shares) Temporary Equity, Shares Issued O 2025 M8 Dividends O 2025 M8 Dividends [Member] O 2025 M8 Dividends Hamptons Apartments Owner, LLC Hamptons Apartments Owner, LLC [Member] Hamptons Apartments Owner, LLC NPRC Parkton Holdings LLC NPRC Parkton Holdings LLC [Member] NPRC Parkton Holdings LLC Effective yield interest income recognized Investment Owned, Effective Yield Interest Income Recognized Investment Owned, Effective Yield Interest Income Recognized Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Eze Castle Integration, Inc. Eze Castle Integration, Inc. [Member] Eze Castle Integration, Inc. Entity Tax Identification Number Household Durables Household Durables Sector [Member] Household Durables Sector Gains (losses) on derivative instruments designated as cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Preferred Stock dividends Preferred Stock Dividends, Income Statement Impact Due to Prospect Capital Management (Note 13) Management Fee Payable Entity Incorporation, State or Country Code Payment-in-kind interest Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Additions For Paid-In-Kind interest Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Additions For Paid-In-Kind interest Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Incentive rate Management and Service Fees, Incentive Rate O 2026 M5 Dividends O 2026 M5 Dividends [Member] O 2026 M3 Aggregate Dividends O 2025 M12 Dividends O 2025 M12 Dividends [Member] O 2025 M12 Dividends Net Amount Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Capital Markets Capital Markets Sector [Member] Capital Markets Sector Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Capital gain Investment Company, Distribution, Long-Term Capital Gain First Brands Group First Brands Group [Member] First Brands Group Julie Lindsey, Inc. Julie Lindsey, Inc. [Member] Julie Lindsey, Inc. Goldenstrand OH Partners, LLC Goldenstrand OH Partners, LLC [Member] Goldenstrand OH Partners, LLC Capital Transactions Temporary Equity, Capital Transactions [Abstract] Temporary Equity, Capital Transactions Conversion of common stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Related party transaction, amounts of transaction Related Party Transaction, Amounts of Transaction Liquidation Preference Outstanding Temporary Equity, Liquidation Preference, Value of Shares Outstanding Temporary Equity, Liquidation Preference, Value of Shares Outstanding Basic (in dollars per share) Earnings (loss) per share - basic (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Broda USA, Inc. Broda USA, Inc. [Member] Broda USA, Inc. Accretion of preferred stock to redemption value Temporary Equity, Accretion to Redemption Value First Lien, Unitranche Debt Securities, First Lien, Unitranche [Member] Debt Securities, First Lien, Unitranche Current assets Assets, Current Increase (decrease) in due to Prospect Administration Increase (Decrease) in Due to Related Parties Insider Trading Arrangements [Line Items] Electrical Equipment Electrical Equipment [Member] Electrical Equipment Financing costs paid and deferred Payments of Financing Costs Document Annual Report Debt Securities, Second Lien 1 Debt Securities, Second Lien1 [Member] Debt Securities, Second Lien1 Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Consumer Finance Consumer Finance Sector [Member] Consumer Finance Sector Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] O 2025 M11 Dividends O 2025 M11 Dividends [Member] O 2025 M11 Dividends Administrative agent fees Administrative Agent Administrative Agent Fees Administrative Agent Fees Bel Canto NPRC Stone Ridge LLC Bel Canto NPRC Stone Ridge LLC [Member] Bel Canto NPRC Stone Ridge LLC Financial commitment, future amount Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount Residual Profit, New TLA and TLD Residual Profit, New TLA and TLD Residual Profit, New TLA and TLD Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Preventics, Inc. (d/b/a Legere Pharmaceuticals) Preventics, Inc. [Member] Preventics, Inc. Discovery Point Retreat, LLC. Discovery Point Retreat, LLC. [Member] Discovery Point Retreat, LLC. Documents Incorporated by Reference Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] % of Portfolio Percentage of total assets at fair value Concentration Risk, Percentage Healthcare Venture Partners, LLC Healthcare Venture Partners, LLC [Member] Healthcare Venture Partners, LLC Return of capital to common stockholders Return of capital Investment Company, Tax Return of Capital Distribution Equity Awards Adjustments Equity Awards Adjustments [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Annualized floating rate Annualized Floating Rate Annualized Floating Rate Industry Sector [Domain] Industry Sector [Domain] Distributions of capital gains to preferred stockholders (in dollars per share) Investment Company, Distribution of Capital Gains to Shareholders, Per Share Investment Company, Distribution of Capital Gains to Shareholders, Per Share 2025 Notes 2025 Notes [Member] 2025 Notes Proceeds from issuance of preferred stock Proceeds from Issuance of Preferred Stock and Preference Stock Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Credit Central of Texas, LLC Credit Central of Texas, LLC [Member] Credit Central of Texas, LLC % of Net Assets Investment Owned, Net Assets, Percentage 5.50% Series AA1 Preferred Stock Series AA1 5.50% Series AA1 Preferred Stock [Member] 5.50% Series AA1 Preferred Stock First Tower, LLC First Tower, LLC [Member] First Tower, LLC Public Notes Prospect Capital InterNotes® Long-Term Debt [Text Block] Vesper Tuscaloosa, LLC Vesper Tuscaloosa, LLC [Member] Vesper Tuscaloosa, LLC Halcyon Loan Advisors Funding 2015-3 Ltd. Halcyon Loan Advisors Funding 2015-3 Ltd. [Member] Halcyon Loan Advisors Funding 2015-3 Ltd. 2016 Notes 2016 Notes [Member] 2016 Notes Parkside at Laurel West Owner LLC Parkside at Laurel West Owner LLC [Member] Parkside at Laurel West Owner LLC Jackson Reflection Pointe LLC Jackson Reflection Pointe LLC [Member] Jackson Reflection Pointe LLC Valora at Homewood Holdings LLC Valora at Homewood Holdings LLC [Member] Valora at Homewood Holdings LLC First Lien Debt Debt Securities, First Lien [Member] Debt Securities, First Lien Conversion of common stock Stock Issued During Period, Value, Conversion of Convertible Securities Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Palmetto Creek Holdings LLC Palmetto Creek Holdings LLC [Member] Palmetto Creek Holdings LLC Total distributions (in dollars per share) Investment Company, Distribution to Shareholders, Per Share Number of real estate properties Number of Real Estate Properties Dukes Root Control Inc. Dukes Root Control Inc. [Member] Dukes Root Control Inc. Risks Relating to Our Investments [Member] Risks Relating to Our Investments Hedging Designation [Domain] Hedging Designation [Domain] Less Than 35% or Equal to 35% Credit Facility, Usage, Less Than 35% or Equal to 35% [Member] Credit Facility, Usage, Less Than 35% or Equal to 35% NMMB Holdings, Inc. NMMB Holdings, Inc. [Member] NMMB Holdings, Inc. Class of Stock [Domain] Class of Stock [Domain] Taco Bell, MO Taco Bell, Mo [Member] Taco Bell, Mo Statement of Cash Flows [Abstract] Foreign Exchange Forward Foreign Exchange Forward [Member] Qualifying assets Qualifying Assets Qualifying Assets Schedule of Stock by Class Schedule of Stock by Class [Table Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Investment Classification, Transactions and Risks Investment, Policy [Policy Text Block] Debt Securities, Second Lien 2 Debt Securities, Second Lien2 [Member] Debt Securities, Second Lien2 Barings CLO 2018-III Barings CLO 2018-III [Member] Barings CLO 2018-III Energy Solutions Holdings Inc. Energy Solutions Holdings Inc. [Member] Energy Solutions Holdings Inc. O 2026 M10 Dividends O 2026 M10 Dividends [Member] O 2026 M10 Dividends Income Taxes Income Tax Disclosure [Text Block] Wellful Inc. Wellful Inc. [Member] Wellful Inc. Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Investment Company, Financial Highlights [Table] Investment Company, Financial Highlights [Table] O 2027 M1 Dividends O 2027 M1 Dividends [Member] O 2027 M1 Dividends Entity Filer Category Credit Central Loan Company, LLC Credit Central Loan Company, LLC [Member] Credit Central Loan Company, LLC Textiles, Apparel & Luxury Goods Textiles, Apparel & Luxury Goods Sector [Member] Textiles, Apparel & Luxury Goods Sector VE Company, Inc. VE Company, Inc. [Member] VE Company, Inc. iQor Holdings, Inc. iQor Holdings, Inc. [Member] iQor Holdings, Inc. Dividends [Axis] Dividends [Axis] Revision of Prior Period [Axis] Revision of Prior Period [Axis] Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Series A1, Series M1, Series M2, Series A3, Series M3, Series A4, and Series M4 shares Series A1, Series M1, and Series M2, Series A3, Series M3, Series A4, and Series M4, And Series A5, and Series M5 [Member] Series A1, Series M1, and Series M2, Series A3, Series M3, Series A4, and Series M4, And Series A5, and Series M5 Marine Transport Marine Transport Sector [Member] Marine Transport Sector Shoes West, LLC (d/b/a Taos Footwear) Shoes West, LLC (d/b/a Taos Footwear) [Member] Shoes West, LLC (d/b/a Taos Footwear) Average stated interest rate Debt Instrument, Interest Rate During Period O 2025 M10 Dividends O 2025 M10 Dividends [Member] O 2025 M10 Dividends O 2027 M2 Dividends O 2027 M2 Dividends [Member] O 2027 M2 Dividends Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] 5.50% Series M1 Preferred Stock Series M1 5.50% Series M1 Preferred Stock [Member] 5.50% Series M1 Preferred Stock Senior securities coverage per unit, including unfunded commitments (in dollars per share) Senior Securities Coverage Per Unit, Including Unfunded Commitments Senior Securities Coverage Per Unit, Including Unfunded Commitments Belnick Holdings of Delaware, LLC Belnick Holdings of Delaware, LLC [Member] Belnick Holdings of Delaware, LLC Net change in unrealized gains (losses) on investments still held Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Total Investment Income Total revenue Gross Investment Income, Operating O 2026 M4 Dividends O 2026 M4 Dividends [Member] O 2026 M4 Dividends 5.00% 2019 Notes 5.00 2019 Notes [Member] 5.00 2019 Notes June 15, 2029 – July 15, 2029 Debt Instrument Redemption Period Eighteen [Member] Debt Instrument Redemption Period Eighteen Derivative Liability Fair Value Foreign currency forward contracts - Liabilities Gross Fair Value Amount of Recognized Liabilities Derivative Liability Senior Notes Senior Notes [Member] Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One Forward Contracts designated as fair value hedging instruments Fair Value Hedging [Member] Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Investments in and Advances to Affiliates, at Fair Value [Roll Forward] O 2025 M6 Dividends O 2025 M6 Dividends [Member] O 2025 M6 Dividends Consolidation Consolidation, Policy [Policy Text Block] Effect of other comprehensive income (in dollars per share) Investment Company, Effect Of Other Comprehensive Income Investment Company, Effect Of Other Comprehensive Income Portfolio turnover rate Investment Company, Portfolio Turnover TP Cheyenne, LLC TP Cheyenne, LLC [Member] TP Cheyenne, LLC Proceeds from legal settlements Proceeds from Legal Settlements Preferred Equity Preferred Equity [Member] Preferred Equity Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Repayment of Loan Receivable Repayment of loan receivable Proceeds from Collection of Loans Receivable Statement [Table] Statement [Table] Sunbury OH Partners, LLC Sunbury OH Partners, LLC [Member] Sunbury OH Partners, LLC Credit Facility Credit Facility [Member] Credit Facility Converted to equity Debt Conversion, Converted Instrument, Amount Gross Amounts of Recognized Assets (Liabilities) Derivative Asset, Subject to Master Netting Arrangement, before Offset Vesper Corpus Christi, LLC Vesper Corpus Christi, LLC, Corpus Christi, TX [Member] Vesper Corpus Christi, LLC, Corpus Christi, TX Floating Rate Preferred Stock Floating Rate Preferred Stock [Member] Floating Rate Preferred Stock Tenor at Origination (in years) Long-Term Debt, Term