Debt Investments Prepayment Risk [Member]
Debt Investments Prepayment Risk
Investments and Net Realized Gains or Losses and Net Unrealized Appreciation or Depreciation
Investment, Policy [Policy Text Block]
Non-control/Non-affiliate investments
Investment, Unaffiliated Issuer [Member]
Investments on Non-accrual Status
Investment Owned, Non-accrual Status [Member]
Investment Owned, Non-accrual Status
Net pension benefit
Pension Expense (Reversal of Expense), Noncash
Realized (gain) loss on investments before income tax
Realized Investment Gains (Losses)
Schedule of Expected Benefit Payments
Schedule of Expected Benefit Payments [Table Text Block]
Award Timing Predetermined
Award Timing Predetermined [Flag]
Entity File Number
Additional Paid-In Capital
Additional Paid-in Capital [Member]
Tabular List, Table
Tabular List [Table Text Block]
INVESTMENTS
Schedule of Investments [Text Block]
Recently Issued or Adopted Accounting Standards
New Accounting Pronouncements, Policy [Policy Text Block]
U.S. TELEPACIFIC CORP.
U.S. TELEPACIFIC CORP [Member]
U.S. TELEPACIFIC CORP
LOGIX HOLDING COMPANY, LLC
LOGIX HOLDING COMPANY, LLC [Member]
LOGIX HOLDING COMPANY, LLC
Expiring letters of credit
Guarantor Obligations, Maximum Exposure, Undiscounted
Debt Investments
Debt Securities [Member]
SBA Debentures
Small Business Administration Debentures [Member]
Small Business Administration Debentures
Total investment return
Investment Company, Total Return, Market Value
Adjustment to Compensation:
Adjustment to Compensation [Axis]
RELATED PARTY TRANSACTIONS
Related Party Transactions Disclosure [Text Block]
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
HEAT TRAK, LLC
HEAT TRAK, LLC [Member]
HEAT TRAK, LLC
(Decrease) increase in net asset value (in usd per share)
Investment Company, Net Asset Value, Per Share, Period Increase (Decrease)
Expiration Period [Domain]
Expiration Period [Domain]
Expiration Period [Domain]
CapTrin
Corporate Joint Venture [Member]
Industrial Services
Industrial Services Sector [Member]
Industrial Services Sector
US COURTSCRIPT HOLDINGS, INC.
US COURTSCRIPT HOLDINGS, INC. [Member]
US COURTSCRIPT HOLDINGS, INC.
Issuance of common stock under restricted stock plan, net of forfeitures (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures
Industrial Products
Industrial Products Sector [Member]
Industrial Products Sector
Area of additional office space
Area of Real Estate Property
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Percent of total investment portfolio's fair value
Percentage of Total Portfolio at Fair Value
Concentration Risk, Percentage
Decrease (increase) in other assets
Increase (Decrease) in Other Operating Assets
Consolidation
Consolidation, Policy [Policy Text Block]
Share-based compensation expense
Share-Based Payment Arrangement, Noncash Expense
New Senior Debt Risk [Member]
New Senior Debt Risk
Liquidity Risk [Member]
Liquidity Risk
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
March 31, 2024
O 2024 Q1 Tax Year Dividends [Member]
O 2024 Q1 Tax Year Dividends
TRU FRAGRANCE & BEAUTY LLC
Tru Fragrance & Beauty LLC [Member]
Tru Fragrance & Beauty LLC
SPV Credit Facility
Special Purpose Vehicle Financing Credit Facility [Member]
Special Purpose Vehicle Financing Credit Facility
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Consumer Products
Consumer Products Sector [Member]
Consumer Products Sector
Realized gain (loss)
Debt and Equity Securities, Realized Gain (Loss)
Cash paid for income taxes
Income Taxes Paid
Total net assets
Beginning balance
Ending balance
Equity, Attributable to Parent
Schedule of Unused Commitments to Extend Credit
Investment Company, Schedule Of Unused Financial Commitments [Table Text Block]
Investment Company, Schedule Of Unused Financial Commitments
Insider Trading Policies and Procedures [Line Items]
Common stock, authorized (in shares)
Common Stock, Shares Authorized
ACACIA BUYERCO V LLC
ACACIA BUYERCO V LLC [Member]
ACACIA BUYERCO V LLC
WINTER SERVICES OPERATIONS, LLC
Winter Services Operations, LLC [Member]
Winter Services Operations, LLC
Other book/tax differences
Investment Company, Tax Basis, Other, Increase (Decrease)
Issuance of common stock (in shares)
Stock Issued During Period, Shares, New Issues
Warrants
Warrants [Policy Text Block]
Warrants
LIFT BRANDS, INC.
LIFT BRANDS, INC [Member]
LIFT BRANDS, INC
Notes
Medium-Term Note [Member]
BRANDNER DESIGN, LLC
BRANDNER DESIGN, LLC, Equity Securities [Member]
BRANDNER DESIGN, LLC, Equity Securities
Gain Contingencies [Table]
Gain Contingencies [Table]
Maximum
Maximum [Member]
Capital loss carryover
Investment Company, Tax Basis, Capital Loss Carryforward (Utilization)
LAB LOGISTICS, LLC
LAB LOGISTICS, LLC [Member]
LAB LOGISTICS, LLC
Income Tax Contingency [Line Items]
Income Tax Contingency [Line Items]
Restricted Stock
Restricted Stock [Member]
Consumer Services
Consumer Services Sector [Member]
Consumer Services Sector
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Investment, Identifier [Axis]
Investment, Identifier [Axis]
Non-cash PIK interest income percent
Investment Income, Paid-In-Kind Interest, Percent
Investment Income, Paid-In-Kind Interest, Percent
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
BOND BRAND LOYALTY ULC
BOND BRAND LOYALTY ULC, Equity Investments [Member]
BOND BRAND LOYALTY ULC, Equity Investments
Investments at fair value
Fair Value
Investment owned, fair value
Fair Value, beginning balance
Fair Value, ending balance
Investment Owned, Fair Value
Debentures due March 2033
Small Business Administration Debentures, Due March 2033 [Member]
Small Business Administration Debentures, Due March 2033
Retirement Benefits [Abstract]
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Control investments
Investment, Affiliated Issuer, Controlled [Member]
CLUTCH, INC.
CLUTCH, INC. [Member]
CLUTCH, INC.
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Expiration Tranche [Axis]
Expiration Tranche [Axis]
Expiration Tranche
Entity Shell Company
Dividend Payment Risk [Member]
Dividend Payment Risk
Southeast
US Southeast Region [Member]
Average borrowings
Long-Term Debt, Average Amount Outstanding
Southwest
US Southwest Region [Member]
Schedule of Long-Term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Statement of Stockholders' Equity [Abstract]
Schedule of Federal and State Income Taxes Paid
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Remaining lease term (in years)
Lessee, Operating Lease, Remaining Lease Term
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Interest
Interest Expense, Operating
July 31, 2025
O 2025 M7 Tax Year Dividends [Member]
O 2025 M7 Tax Year Dividends
CDC DENTAL MANAGEMENT CO., LLC
CDC DENTAL MANAGEMENT CO., LLC [Member]
CDC DENTAL MANAGEMENT CO., LLC
Capital Raise Terms Risk [Member]
Capital Raise Terms Risk
Other
Other Receivables
Investment Company, Summary Of Dividends And Distributions, Tax Differences [Line Items]
Investment Company, Summary Of Dividends And Distributions, Tax Differences [Line Items]
Investment Company, Summary Of Dividends And Distributions, Tax Differences [Line Items]
Proceeds from sales and return of capital of equity investments in portfolio companies
Proceeds From Disposition Of Investment, Equity Securities, Operating Activity
Proceeds From Disposition Of Investment, Equity Securities, Operating Activity
Estimated annual RIC undistributed taxable income
Investment Company, Undistributed Taxable Income
Investment Company, Undistributed Taxable Income
Document Fiscal Period Focus
Earnings
Investment Company, Tax Reclassification, Increase (Decrease)
Award Timing Method
Award Timing Method [Text Block]
Net increase in net assets from operations per share - basic (in usd per share)
Income (Loss) from Continuing Operations, Per Basic Share
Aerospace & Defense
Aerospace And Defense Sector [Member]
Aerospace And Defense Sector
Award Type [Axis]
Award Type [Axis]
Investment, Name [Domain]
Investment, Name [Domain]
Stock-Based Compensation
Share-Based Payment Arrangement [Policy Text Block]
Trading Symbol
2030
Lessee, Operating Lease, Liability, to be Paid, Year Four
Legislative Or Taxation Risk [Member]
Legislative Or Taxation Risk
Entity Address, City or Town
Technology Products & Components
Technology Sector [Member]
PRECISION SPRAY & COATINGS, LLC
PRECISION SPRAY & COATINGS, LLC [Member]
PRECISION SPRAY & COATINGS, LLC
Number of lenders
Number Of Lenders
Number Of Lenders
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Interest Cost, Statement of Income or Comprehensive Income Extensible List Not Disclosed Flag
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Interest Cost, Statement of Income or Comprehensive Income Extensible List Not Disclosed Flag
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Interest Cost, Statement of Income or Comprehensive Income Extensible List Not Disclosed Flag
Shares repurchased for restricted stock awards vested
Shares Repurchased, Restricted Stock Awards Vested [Member]
Shares Repurchased, Restricted Stock Awards Vested
2027
Financial Commitment Year Two [Member]
Financial Commitment Year Two
Proceeds from sales and repayments of debt investments in portfolio companies
Proceeds From Disposition Of Investment, Debt Securities, Operating Activity
Proceeds From Disposition Of Investment, Debt Securities, Operating Activity
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
Environmental Services
Environmental Services Sector [Member]
Environmental Services Sector
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
ATS OPERATING, LLC
ATS OPERATING, LLC [Member]
ATS OPERATING, LLC
Entity Emerging Growth Company
2029
Long-Term Debt, Maturity, Year Three
January 2026 Notes
January 2026 Notes [Member]
January 2026 Notes
PIK Interest Capitalized
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Paid-in-Kind Interest Capitalized
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Paid-in-Kind Interest Capitalized
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]
Debt issuance costs (net of accumulated amortization of $13,172 and $10,357, respectively)
Debt Issuance Costs, Net
WELL-FOAM, INC.
WELL-FOAM, INC [Member]
WELL-FOAM, INC
2027
Defined Benefit Plan, Expected Future Benefit Payment, Year One
Redemption Risk [Member]
Redemption Risk
WASH & WAX SYSTEMS LLC
WASH & WAX HOLDINGS LLC [Member]
WASH & WAX HOLDINGS LLC
Common stock, outstanding (in shares)
Beginning balance (in shares)
Ending balance (in shares)
Common shares outstanding at end of period (in shares)
Common Stock, Shares, Outstanding
Federal income, excise and other taxes
Investment Income, Operating, Federal Income, Excise And Other Taxes
Investment Income, Operating, Federal Income, Excise And Other Taxes
Default Risk [Member]
Default Risk
Distributions of long term capital gains
Investment Company, Distribution, Long-Term Capital Gain
SBA Debentures [Member]
SBA Debentures
June 30, 2025
O 2025 Q2 Tax Year Dividends [Member]
O 2025 Q2 Tax Year Dividends
Total Control & Affiliate Investments
Investment, Affiliated Issuer [Member]
LIGHTING RETROFIT INTERNATIONAL, LLC (DBA ENVOCORE)
LIGHTING RETROFIT INTERNATIONAL, LLC (DBA ENVOCORE) [Member]
LIGHTING RETROFIT INTERNATIONAL, LLC (DBA ENVOCORE)
Building & Infrastructure Products
Building & Infrastructure Products Sector [Member]
Building & Infrastructure Products Sector
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]
Letters of credit drawn
Guarantor Obligations, Current Carrying Value
CapTrin Credit Facility
CapTrin Credit Facility [Member]
CapTrin Credit Facility
Expense/loss recognized for tax on pass-through entities
Investment Company, Tax Basis Reconciliation, Income (Expense) Recognized For Pass-Through Entities, Increase (Decrease) In Taxable Income
Investment Company, Tax Basis Reconciliation, Income (Expense) Recognized For Pass-Through Entities, Increase (Decrease) In Taxable Income
Gross proceeds received
Proceeds from Issuance or Sale of Equity
Change in benefit obligation
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Interest income:
Interest Income, Operating [Abstract]
Estimated distributable income before deductions for distributions
Investment Company, Tax Basis, Taxable Income (Loss), before Deduction for Distribution
Pledged Status [Domain]
Pledged Status [Domain]
Number of Shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
SWENSONS DRIVE-IN RESTAURANTS, LLC
SWENSONS DRIVE-IN RESTAURANTS, LLC [Member]
SWENSONS DRIVE-IN RESTAURANTS, LLC
Entity Address, Postal Zip Code
Restatement Determination Date
Restatement Determination Date
Total income tax provision
Income Tax Expense (Benefit)
Effective Allocation And Management Of Capital Risk [Member]
Effective Allocation And Management Of Capital Risk
Basis spread on variable rate
Debt Instrument, Basis Spread on Variable Rate
Other assets
Other Assets
Fair value, beginning balance
Fair value. ending balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Purchases and originations of investments
Funded
Payment for Purchase, Investment, Operating Activity
SBA Debentures (net of $5,333 and $4,082, respectively, of unamortized debt issuance costs)
Unsecured Debt
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
MICROBE FORMULAS LLC
MICROBE FORMULAS LLC [Member]
MICROBE FORMULAS LLC
BURNING GLASS INTERMEDIATE HOLDING COMPANY, INC.
BURNING GLASS INTERMEDIATE HOLDING COMPANY, INC. [Member]
BURNING GLASS INTERMEDIATE HOLDING COMPANY, INC.
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
October 2026 Notes
October 2026 Notes [Member]
October 2026 Notes
Pharmaceuticals, Biotechnology & Life Sciences
Pharmaceuticals, Biotechnology & Life Sciences Sector [Member]
Pharmaceuticals, Biotechnology & Life Sciences Sector
Gross unrealized depreciation
Investment, Tax Basis, Unrealized Loss
Debentures due September 2031
Small Business Administration Debentures, Due September 2031 [Member]
Small Business Administration Debentures, Due September 2031
Schedule of Subsidiary or Equity Method Investee [Table]
Subsidiary or Equity Method Investee, Sale of Stock [Table]
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Equity, Class of Treasury Stock [Line Items]
Equity, Class of Treasury Stock [Line Items]
Number of additional sales agents
Sale Of Stock, Number Of Additional Sales Agents
Sale Of Stock, Number Of Additional Sales Agents
Federal
Income Tax Paid, Federal, after Refund Received
All Trading Arrangements
All Trading Arrangements [Member]
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Redemption price, percentage
Debt Instrument, Redemption Price, Percentage
Class of Treasury Stock [Table]
Class of Treasury Stock [Table]
Deferred tax liabilities:
Deferred Tax Liabilities, Gross [Abstract]
Undistributed net realized (loss) gain
Investment Company, Distributable Earnings (Loss), Accumulated Long-Term Capital Gain (Loss)
Beginning balance (in shares)
Ending balance (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Commitments and Contingencies Disclosure [Abstract]
September 2030 Notes
September 2030 Notes [Member]
September 2030 Notes
LEHR UPFITTERS, LLC
LEHR UPFITTERS, LLC [Member]
LEHR UPFITTERS, LLC
Net cash (used in) provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Industrial Machinery
Industrial Machinery Sector [Member]
Industrial Machinery Sector
Maturity (in years)
Debt Instrument, Term
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Aggregate cost of shares repurchased
Treasury Stock, Retired, Cost Method, Amount
Divestitures
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
DAMOTECH INC.
DAMOTECH INC., Equity Investments [Member]
DAMOTECH INC., Equity Investments
Subsequent Event
Subsequent Event [Member]
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
PEO Total Compensation Amount
PEO Total Compensation Amount
Long-Term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
PIK
Investment, Interest Rate, Paid in Kind
Nonqualified assets
Investment Company, Percent Of Nonqualified Assets
Investment Company, Percent Of Nonqualified Assets
Schedule of Investments [Table]
Schedule of Investments [Abstract]
Equity Components [Axis]
Equity Components [Axis]
Convertible Debt
Convertible Debt [Member]
Realized loss on extinguishment of debt (in usd per share)
Investment Company, Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax
Investment Company, Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Conversion/Exchange of Security
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Conversion Or Reclassification Of Security
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Conversion Or Reclassification Of Security
Number of reportable segments
Number of Reportable Segments
Terrorist Attacks, Acts Of War Or Natural Disasters Risk [Member]
Terrorist Attacks, Acts Of War Or Natural Disasters Risk
Debentures due March 2034
Small Business Administration Debentures, Due March 2034 [Member]
Small Business Administration Debentures, Due March 2034
GRAMMATECH, INC.
GRAMMATECH, INC [Member]
GRAMMATECH, INC
Distribution
Distribution Sector [Member]
Distribution Sector
Entity Address, State or Province
Amount of Interest or Dividends Credited in Income
Interest and Dividend Income, Operating
Future Realized Losses Risk [Member]
Future Realized Losses Risk
Delayed Draw Term Loans
Delayed Draw Term Loan (DDTL) [Member]
Numerator for increase in net assets per share
Undistributed Earnings (Loss) Available to Common Shareholders, Diluted
2030
Defined Benefit Plan, Expected Future Benefit Payment, Year Four
Affiliate investments
Investment, Affiliated Issuer, Noncontrolled [Member]
Issuance price percent received
Debt Instrument, Issuance Price, Percent Of Principal Amount
Debt Instrument, Issuance Price, Percent Of Principal Amount
Debt Instrument, Rate Period [Axis]
Debt Instrument, Rate Period [Axis]
Debt Instrument, Rate Period
Investment Company, Net Assets [Roll Forward]
Investment Company, Net Assets [Roll Forward]
Individual:
Individual [Axis]
Fee Income
Revenue Recognition, Fee Income Policy [Policy Text Block]
Revenue Recognition, Fee Income Policy
Matching contributions cost
Defined Contribution Plan, Cost
Decrease (increase) in other receivables
Increase (Decrease) in Other Receivables
Document Annual Report
March 31, 2025
O 2025 Q1 Tax Year Dividends [Member]
O 2025 Q1 Tax Year Dividends
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Shareholder Distributions
Investment Company, Distribution [Policy Text Block]
Entity Interactive Data Current
October 31, 2025
O 2025 M10 Tax Year Dividends [Member]
O 2025 M10 Tax Year Dividends
Unrealized Gain Risk [Member]
Unrealized Gain Risk
November 30, 2025
O 2025 M11 Tax Year Dividends [Member]
O 2025 M11 Tax Year Dividends
Cost
Investment Owned, Cost
Payment of accreted original issue discounts
Accretion Of Original Issue Discounts
Accretion Of Original Issue Discounts
Net operating loss carryforwards
Deferred Tax Assets, Operating Loss Carryforwards
Long-Lived Tangible Asset [Axis]
Long-Lived Tangible Asset [Axis]
GPT INDUSTRIES, LLC
GPT INDUSTRIES, LLC [Member]
GPT INDUSTRIES, LLC
2028
Financial Commitment Year Three [Member]
Financial Commitment Year Three
August 31, 2025
O 2025 M8 Tax Year Dividends [Member]
O 2025 M8 Tax Year Dividends
Grant market value
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Per Director
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Per Director
DAMOTECH INC.
DAMOTECH INC. [Member]
DAMOTECH INC.
KMS, LLC
KMS, LLC [Member]
KMS, LLC
2028
Defined Benefit Plan, Expected Future Benefit Payment, Year Two
Total net unrealized (depreciation) appreciation on investments, net of tax
Net unrealized appreciation on investments
Net change in unrealized (depreciation) appreciation on investments, net of tax
Unrealized Gain (Loss), Investment and Derivative, Operating, after Tax
Net asset value per share (in usd per share)
Beginning of period (in usd per share)
End of period (in usd per share)
Distributions in kind received
Distributions In Kind Received
Distributions In Kind Received
Entity Central Index Key
PEO Name
PEO Name
Conversion price (in usd per share)
Debt Instrument, Convertible, Conversion Price
Schedule of Contractual Payment Obligations
Schedule of Maturities of Long-Term Debt [Table Text Block]
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]
Gross sales commission percentage
Sale Of Stock, Gross Sales Price Commission Percentage
Sale Of Stock, Gross Sales Price Commission Percentage
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Supplemental cash flow disclosures:
Supplemental Cash Flow Elements [Abstract]
MAMMOTH BORROWCO, INC.
MAMMOTH BORROWCO, INC. [Member]
MAMMOTH BORROWCO, INC.
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Midwest
US Midwest Region [Member]
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC (fka ROOF OPCO, LLC)
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC (fka ROOF OPCO, LLC), Equity Investments [Member]
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC (fka ROOF OPCO, LLC), Equity Investments
First Lien Loans, Last Out
First Lien Loans, Last Out [Member]
First Lien Loans, Last Out
Exercise Price
Award Exercise Price
Entity Filer Category
Benefits paid
Defined Benefit Plan, Benefit Obligation, Benefits Paid
Non-vested restricted stock awards
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Second Lien Loans, Split Lien Term Loans
Second Lien Loans, Split Lien Term Loans [Member]
Second Lien Loans, Split Lien Term Loans
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
December 31, 2024 supplemental
S 2024 Q4 Tax Year Dividends [Member]
S 2024 Q4 Tax Year Dividends
Schedule of Investments in and Advances to Affiliates
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table 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]
RED DOG OPERATIONS HOLDING COMPANY LLC
RED DOG OPERATIONS HOLDING COMPANY LLC [Member]
RED DOG OPERATIONS HOLDING COMPANY LLC
LASH OPCO, LLC
Lash OpCo, LLC [Member]
Lash OpCo, LLC
Entity Address, Address Line One
Entity Address, Address Line Two
Weighted average price per share (in usd per share)
Sale Of Stock, Weighted Average, Price Per Share
Sale Of Stock, Weighted Average, Price Per Share
Gross unrealized appreciation
Investment, Tax Basis, Unrealized Gain
Investments [Domain]
Investments [Domain]
Common stock withheld for payroll taxes upon vesting of restricted stock (in shares)
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation
Industry Sector [Axis]
Industry Sector [Axis]
Investment income:
Net Investment Income [Abstract]
Fair Value as of Grant Date
Award Grant Date Fair Value
THE GOBEL GROUP, LLC
THE GOBEL GROUP, LLC, Equity Securities [Member]
THE GOBEL GROUP, LLC, Equity Securities
Small Business Administration Regulatory Risk [Member]
Small Business Administration Regulatory Risk
Compensation
Compensation Expense, Excluding Cost of Good and Service Sold
Income tax payable
Accrued Income Taxes
Transactions With Affiliates Risk [Member]
Transactions With Affiliates Risk
2029
Financial Commitment Year Four [Member]
Financial Commitment Year Four
Schedule of Notes and SBA Debentures
Schedule of Long-Term Debt Instruments [Table Text Block]
Repurchase of common stock (in usd per share)
Investment Company, Share Repurchase, Per Share
Reclassification for certain permanent book-to-tax differences
Reclassification For Certain Permanent Book-To-Tax Differences
Reclassification For Certain Permanent Book-To-Tax Differences
Fair Value Valuation Risk [Member]
Fair Value Valuation Risk
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Forfeited (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Adjustment for interest and amortization on 2029 Convertible Notes
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities
After April 20 2024
After April 20 2024 [Member]
After April 20 2024
Gross Reductions
Investments in and Advances to Affiliates, at Fair Value, Gross Reductions
Estimated Fair Value
Long-Term Debt, Fair Value
Schedule of Valuation Techniques and Significant Level 3 Inputs
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Counterparty Name [Domain]
Counterparty Name [Domain]
STELLANT MIDCO, LLC
STELLANT MIDCO, LLC [Member]
STELLANT MIDCO, LLC
2028
Lessee, Operating Lease, Liability, to be Paid, Year Two
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
CUMBRIA CAPITAL MSO, LLC
CUMBRIA CAPITAL MSO, LLC [Member]
CUMBRIA CAPITAL MSO, LLC
Investment Type [Axis]
Investment Type [Axis]
Title
Trading Arrangement, Individual Title
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
2029
Defined Benefit Plan, Expected Future Benefit Payment, Year Three
DYNAMIC COMMUNITIES, LLC
DYNAMIC COMMUNITIES, LLC [Member]
DYNAMIC COMMUNITIES, LLC
Cumulative undistributed taxable income (in usd per share)
Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss), Per Share
Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss), Per Share
ACCELERATION, LLC
ACCELERATION, LLC, Equity Investments [Member]
ACCELERATION, LLC, Equity Investments
Bank Relationship Risk [Member]
Bank Relationship Risk
Non-PEO NEO
Non-PEO NEO [Member]
MUSIKER DISCOVERY PROGRAMS, INC.
MUSIKER DISCOVERY PROGRAMS, INC. [Member]
MUSIKER DISCOVERY PROGRAMS, INC.
Fee income
Fee Income
Inflation Risk [Member]
Inflation Risk
Market Discount Risk [Member]
Market Discount Risk
Sale of Stock [Axis]
Sale of Stock [Axis]
September 30, 2024
O 2024 Q3 Tax Year Dividends [Member]
O 2024 Q3 Tax Year Dividends
Award Type [Domain]
Award Type [Domain]
Investments in and Advances to Affiliates [Abstract]
2027
Lessee, Operating Lease, Liability, to be Paid, Year One
GAINS INTERMEDIATE, LLC
GAINS INTERMEDIATE, LLC [Member]
GAINS INTERMEDIATE, LLC
Debentures due March 2036
Small Business Administration Debentures Due, March 2036 Pool [Member]
Small Business Administration Debentures Due, March 2036 Pool
O 2026 M1 Tax Year Dividends
O 2026 M1 Tax Year Dividends [Member]
O 2026 M1 Tax Year Dividends
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Regulatory capital
Regulatory Capital
Regulatory Capital
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]
Other income
Other Income
Compensation Amount
Outstanding Recovery Compensation Amount
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
GRAMMATECH, INC.
GRAMMATECH, INC, Equity Investments [Member]
GRAMMATECH, INC, Equity Investments
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Schedule of Investments [Line Items]
Schedule of Investments [Line Items]
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
Amount of Unrealized Gain/(Loss)
Investments In And Advances To Affiliates, At Fair Value, Unrealized Change In Fair Value
Investments In And Advances To Affiliates, At Fair Value, Unrealized Change In Fair Value
SPOTLIGHT AR, LLC
Spotlight AR, LLC [Member]
Spotlight AR, LLC
Investment Portfolio Risk [Member]
Investment Portfolio Risk
Percentage of equity interest
Equity Ownership, Excluding Consolidated Entity and Equity Method Investee, Percentage
NEW SKINNY MIXES, LLC
NEW SKINNY MIXES, LLC [Member]
NEW SKINNY MIXES, LLC
Other
Unused Commitments To Lend, Other [Member]
Unused Commitments To Lend, Other
Documents Incorporated by Reference
Tariff, Import And Export Regulatory Uncertainty Risk [Member]
Tariff, Import And Export Regulatory Uncertainty Risk
2027
Long-Term Debt, Maturity, Year One
Financial Instruments [Domain]
Financial Instruments [Domain]
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Purchases of Investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases
2031
Long-Term Debt, Maturity, Year Five
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
Interest on non-accrual loans
Investment Company, Tax Basis Reconciliation, Interest On Non-accrual Loans, Increase (Decrease) In Taxable Income
Investment Company, Tax Basis Reconciliation, Interest On Non-accrual Loans, Increase (Decrease) In Taxable Income
Minimum
Minimum [Member]
Company Selected Measure Name
Company Selected Measure Name
Commercial Services & Supplies
Commercial Services and Supplies [Member]
Commercial Services and Supplies
First Lien Loans, Split Lien Term Loans
First Lien Loans, Split Lien Term Loans [Member]
First Lien Loans, Split Lien Term Loans
BORROWINGS
Debt Disclosure [Text Block]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Portfolio turnover
Investment Company, Portfolio Turnover
GUARDIAN FLEET SERVICES, INC.
GUARDIAN FLEET SERVICES, INC. [Member]
GUARDIAN FLEET SERVICES, INC.
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
Effect Of Global Climate Change Risk [Member]
Effect Of Global Climate Change Risk
Privately held debt and equity instruments
Privately Held Debt And Equity Instruments [Member]
Privately Held Debt And Equity Instruments [Member]
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies Disclosure [Text Block]
Before March 20 2027
Before March 20 2027 [Member]
Before March 20 2027
AAC NEW HOLDCO INC.
AAC NEW HOLDCO INC., Equity Investments [Member]
AAC NEW HOLDCO INC., Equity Investments
Weighted average common shares outstanding – diluted (in shares)
Denominator for diluted weighted average common shares (in shares)
Weighted-average diluted common shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Segment Reporting
Segment Reporting, Policy [Policy Text Block]
Financial Support to Nonconsolidated Legal Entity [Axis]
Financial Support to Nonconsolidated Legal Entity [Axis]
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
August 2028 Notes Overallotment
August 2028 Notes Overallotment [Member]
August 2028 Notes Overallotment
Weighted Average Vesting Term (in years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms
Current asset coverage ratio
Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio
Schedule of Book and Tax Basis Differences Relating to Dividends and Distributions
Investment Company, Dividends and Distributions, Tax Differences [Table Text Block]
Investment Company, Dividends and Distributions, Tax Differences
Entity Small Business
Income Tax Disclosure [Abstract]
Payment-in-kind interest
Payment-In-Kind Interest Accrued
Payment-In-Kind Interest Accrued
Schedule of Changes in Benefit Obligation
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
Market Price Risk [Member]
Market Price Risk
Unused commitment and other fees
Line of Credit Facility, Commitment Fee Amount
Document Transition Report
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Trinity
Trinity Capital Inc. [Member]
Trinity Capital Inc.
Underlying Securities
Award Underlying Securities Amount
Equity Component [Domain]
Equity Component [Domain]
Conversion premium
Debt Instrument, Convertible, Conversion Premium Percentage
Debt Instrument, Convertible, Conversion Premium Percentage
Document Period End Date
Audit Information [Abstract]
Audit Information
INCOME TAXES
Income Tax Disclosure [Text Block]
Share based compensation expense (in usd per share)
Investment Company, Share Based Compensation Expense, Per Share
Investment Company, Share Based Compensation Expense, Per Share
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Percentage of Total Portfolio at Fair Value
Investment Owned, Fair Value [Member]
Investment Owned, Fair Value
ISI ENTERPRISES, LLC
ISI ENTERPRISES, LLC [Member]
ISI ENTERPRISES, LLC
Schedule of Investments [Table]
Schedule of Investments [Table]
Nonperforming Loan Risk [Member]
Nonperforming Loan Risk
Income Approach
Valuation, Income Approach [Member]
FDIC uninsured amount
Cash, Uninsured Amount
Software & IT Services
Software And IT Services Sector [Member]
Software And IT Services Sector
Weighted average price per share (in usd per share)
Shares Acquired, Average Cost Per Share
Subordinated Debt Risk [Member]
Subordinated Debt Risk
March 31, 2025 supplemental
S 2025 Q1 Tax Year Dividends [Member]
S 2025 Q1 Tax Year Dividends
Document Type
Significant Unobservable Inputs (Level 3)
Fair Value, Inputs, Level 3 [Member]
EARNINGS PER SHARE
Earnings Per Share [Text Block]
Name
Outstanding Recovery, Individual Name
Additional paid-in capital
Additional Paid in Capital
Schedule of Net Assets Resulting from Operations to Estimated RIC Taxable Income
Federal Income Tax Note [Table Text Block]
Available leverage commitment
Leverageable Capital
Leverageable Capital
SPECTRUM OF HOPE, LLC
SPECTRUM OF HOPE, LLC [Member]
SPECTRUM OF HOPE, LLC
Per Share Data:
Investment Company, Per Share Data [Abstract]
Investment Company, Per Share Data [Abstract]
Net unrealized appreciation (depreciation)
Investment, Tax Basis, Unrealized Gain (Loss)
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Accordion feature increase limit
Line of Credit Facility, Accordion Feature, Increase Limit
Line of Credit Facility, Accordion Feature, Increase Limit
September 30, 2025 supplemental
S 2025 M9 Tax Year Dividends [Member]
S 2025 M9 Tax Year Dividends
Repurchase authorized amount
Share Repurchase Program, Authorized, Amount
Change In Laws Or Regulation Risk [Member]
Change In Laws Or Regulation Risk
ARKSTONE MEDICAL SOLUTIONS LLC
ARKSTONE MEDICAL SOLUTIONS LLC [Member]
ARKSTONE MEDICAL SOLUTIONS LLC
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
After March 20 2027
After March 20 2027 [Member]
After March 20 2027
Common stock withheld for payroll taxes upon vesting of restricted stock
Payment, Tax Withholding, Share-Based Payment Arrangement
Target investment
Investment Company, Target Investment
Investment Company, Target Investment
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Priority Risk [Member]
Priority Risk
Numerator for basic earnings per common share
Net Income (Loss) Available to Common Stockholders, Basic
RIC
Consolidated Entity, Excluding VIE [Member]
Letters of Credit Issued and Outstanding
Financial Standby Letter of Credit [Member]
GULF PACIFIC ACQUISITION, LLC
GULF PACIFIC ACQUISITION, LLC [Member]
GULF PACIFIC ACQUISITION, LLC
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
C&M CONVEYOR, INC.
C&M CONVEYOR, INC. [Member]
C&M CONVEYOR, INC.
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Inputs, Level 1 [Member]
Credit Facilities
Long-Term Line of Credit
Non-deductible compensation
Investment Company, Tax Basis Reconciliation, Non-Deductible Compensation, Increase (Decrease) In Taxable Income
Investment Company, Tax Basis Reconciliation, Non-Deductible Compensation, Increase (Decrease) In Taxable Income
Schedule of Related Party Transactions, by Related Party [Table]
Related Party Transaction [Table]
Net increase in net assets from operations - diluted (in usd per share)
Diluted earnings per common share (in usd per share)
Earnings Per Share, Diluted
Operating Flexibility Failure To Qualify Risk [Member]
Operating Flexibility Failure To Qualify Risk
March 2027
Expiration Tranche Two [Member]
Expiration Tranche Two
Commercial Services & Supplies
Commercial Services & Supplies [Member]
Commercial Services & Supplies
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC (FKA ROOF OPCO, LLC)
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC (fka ROOF OPCO, LLC) [Member]
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC (fka ROOF OPCO, LLC)
Schedule of Assumptions Used
Defined Benefit Plan, Assumptions [Table Text Block]
Number of shares sold (in shares)
Sale of Stock, Number of Shares Issued in Transaction
Dividends [Axis]
Dividends [Axis]
Beginning balance (in shares)
Ending balance (in shares)
Treasury Stock, Common, Shares
S 2026 Q4 Dividends
S 2026 Q4 Dividends [Member]
S 2026 Q4 Dividends
State
Income Tax Paid, State and Local, after Refund Received
Cancellation of treasury stock
Treasury Stock, Value, Cancelled
Treasury Stock, Value, Cancelled
Notes
Medium-Term Note
Auditor Location
Schedule of Components of Estimated Tax Basis RIC Accumulated Earnings
Investment Company, Components Of Distributable Earnings (Accumulated Losses) [Table Text Block]
Investment Company, Components Of Distributable Earnings (Accumulated Losses)
Actuarial gain
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
Interest income
Interest Income, Operating, Paid in Cash
March 31, 2023
O 2023 Q1 Tax Year Dividends [Member]
O 2023 Q1 Tax Year Dividends
Cash held in money market funds
Money Market Funds, at Carrying Value
Total
Income Taxes Paid, Net
Non-deductible tax expense
Investment Company, Tax Basis, Expense, Not Deductible
Own Share Dealing Risk [Member]
Own Share Dealing Risk
MAIN LINE BRANDS LLC
MAIN LINE BRANDS LLC [Member]
MAIN LINE BRANDS LLC
December 31, 2023 supplemental
S 2023 Q4 Tax Year Dividends [Member]
S 2023 Q4 Tax Year Dividends
Financial Services
Financial Services
Financial Services Sector [Member]
Leverage commitment amount drawn
Outstanding Balance
Debenture Amount
Total
Long-Term Debt, Gross
Entity Well-known Seasoned Issuer
Total
Lessee, Operating Lease, Liability, to be Paid
Taxable Subsidiary
Subsidiaries [Member]
Variable rate
Investment, Basis Spread, Variable Rate
EDGE AUTONOMY HOLDINGS, LLC
EDGE AUTONOMY HOLDINGS, LLC [Member]
EDGE AUTONOMY HOLDINGS, LLC
Numerator for diluted earnings per common share
Net Income (Loss) Attributable to Parent, Diluted
Qualified Dividends
O 2025 A Qualified Dividends [Member]
O 2025 A Qualified Dividends
Referral Relationship Risk [Member]
Referral Relationship Risk
Shares (in shares)
Investment Owned, Balance, Shares
Dividends [Domain]
Dividends [Domain]
Equity ATM Program
Equity ATM Program [Member]
Equity ATM Program
Expiration Date
Trading Arrangement Expiration Date
Net investment income per share – basic (in usd per share)
Net investment income (in usd per share)
Investment Company, Investment Income (Loss), Per Share, Basic
(Decrease) increase in other liabilities
Increase (Decrease) in Other Operating Liabilities
Remaining receivable
Sale of Stock, Consideration Receivable
Sale of Stock, Consideration Receivable
Payment-in-kind interest income
Interest Income, Operating, Paid in Kind
Total Investments
Investments [Member]
Geographic
Geographic Concentration Risk [Member]
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
GRAVITIQ LLC
GRAVITIQ LLC [Member]
GRAVITIQ LLC
O 2026 M6 Tax Year Dividends
O 2026 M6 Tax Year Dividends [Member]
O 2026 M6 Tax Year Dividends
Entity Current Reporting Status
Schedule of Investments
Investment Holdings, Schedule of Investments [Table Text Block]
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Proceeds from issuance of 2029 Convertible Notes
Proceeds from Convertible Debt
Consolidated Entities [Domain]
Consolidated Entities [Domain]
LDG ACQUISITION COMPANY, LLC
LDG ACQUISITION COMPANY, LLC [Member]
LDG ACQUISITION COMPANY, LLC
Transportation & Logistics
Transportation Sector [Member]
Ratio of operating expenses to average net assets
Investment Company, Expense Ratio, after Fee Waiver and Incentive Fee Deduction
Realized loss on disposal of fixed assets
Realized loss on disposal of fixed assets
Gain (Loss) on Disposition of Property Plant Equipment
Business Services Industry Risk [Member]
Business Services Industry Risk
Financial Instrument [Axis]
Financial Instrument [Axis]
Schedule of Investments in and Advances to Affiliates
Investments in and Advances to Affiliates, Schedule of Investments [Text Block]
Deferred tax asset:
Deferred Tax Assets, Gross [Abstract]
Statement of Financial Position [Abstract]
Executive Category:
Executive Category [Axis]
VTX HOLDINGS, INC.
VTX HOLDINGS, INC., Equity Investments [Member]
VTX HOLDINGS, INC., Equity Investments
Before April 20 2024
Before April 20 2024 [Member]
Before April 20 2024
Deferred taxes
Investment Income, Operating, Deferred Taxes
Investment Income, Operating, Deferred Taxes
Average borrowings
Line of Credit Facility, Average Outstanding Amount
Accumulated benefit obligation
Defined Benefit Plan, Accumulated Benefit Obligation
Market Approach
Valuation, Market Approach [Member]
Current Fiscal Year End Date
Alternative Reference Rates Economic Results Risk [Member]
Alternative Reference Rates Economic Results Risk
2029 Convertible Notes Overallotement
2029 Convertible Notes Overallotement [Member]
2029 Convertible Notes Overallotement
2032
Financial Commitment Year Seven [Member]
Financial Commitment Year Seven
BRANDNER DESIGN, LLC
BRANDNER DESIGN, LLC [Member]
Brandner design, llc
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Expected Return (Loss), Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Expected Return (Loss), Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag
Total Unfunded Debt Commitments
Debt Commitments [Member]
Debt Commitments
Weighted Average Fair Value Per Share at grant date
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Remaining number of shares authorized (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Realized gain (loss)
Realized Investment Gains (Losses) [Abstract]
Professional fees
Professional Fees
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
Financial Support to Nonconsolidated Legal Entity [Domain]
Financial Support to Nonconsolidated Legal Entity [Domain]
Percent of investment assets
Investment Owned, Percent Of Portfolio
Investment Owned, Percent Of Portfolio
Anti-dilutive securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Credit Facility [Member]
Credit Facility
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
March 31, 2024 supplemental
S 2024 Q1 Tax Year Dividends [Member]
S 2024 Q1 Tax Year Dividends
2028
Long-Term Debt, Maturity, Year Two
Other Commitments [Table]
Other Commitments [Table]
Income tax benefit (provision)
Unrealized Gain (Loss), Investment and Derivative, Operating, Tax Expense (Benefit)
Net cash provided by financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Measure:
Measure [Axis]
SERVERLIFT, LLC
SERVERLIFT, LLC [Member]
SERVERLIFT, LLC
Net realized gain (loss), net of tax (in usd per share)
Investment Company, Realized Gain (Loss) on Investment, Per Share
Valuation Approach and Technique [Axis]
Valuation Approach and Technique [Axis]
EXACT BORROWER, LLC
EXACT BORROWER, LLC [Member]
EXACT BORROWER, LLC
Long-Lived Tangible Asset [Domain]
Long-Lived Tangible Asset [Domain]
Percentage of Total Portfolio at Cost
Investment Owned, Cost [Member]
Investment Owned, Cost
TMT BHC BUYER, INC.
TMT BHC BUYER, INC. [Member]
TMT BHC BUYER, INC.
Issuance of common stock under restricted stock plan, net of forfeitures
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures
Available under the equity ATM program
Share Repurchase Program, Remaining Authorized, Amount
SUPERIOR HEALTH PARENT LLC
SUPERIOR HEALTH PARENT LLC [Member]
SUPERIOR HEALTH PARENT LLC
Dividends and interest
Dividend and Interest Receivable
S 2027 Q1 Dividends
S 2027 Q1 Dividends [Member]
S 2027 Q1 Dividends
ISI ENTERPRISES, LLC
ISI Enterprises, LLC, Equity Investments [Member]
ISI Enterprises, LLC, Equity Investments
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Amounts recognized in our Consolidated Statements of Assets and Liabilities
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Amortization of deferred financing costs
Amortization of Debt Issuance Costs
Total operating expenses
Investment Income, Investment Expense
Entity Tax Identification Number
MISSION CRITICAL GROUP, LLC
MISSION CRITICAL GROUP, LLC [Member]
MISSION CRITICAL GROUP, LLC
KINDRED PET SERVICE, LLC (fka RED DOG OPERATIONS HOLDING COMPANY LLC)
KINDRED PET SERVICE, LLC (fka RED DOG OPERATIONS HOLDING COMPANY LLC) [Member]
KINDRED PET SERVICE, LLC (fka RED DOG OPERATIONS HOLDING COMPANY LLC)
Education
Education Sector [Member]
Education Sector
Common stock, issued (in shares)
Common Stock, Shares, Issued
2030
Long-Term Debt, Maturity, Year Four
Net basis differences in portfolio investments
Deferred Tax Liabilities, Basis Differences In Portfolio Investments Net
Deferred Tax Liabilities, Basis Differences In Portfolio Investments Net
Entity Public Float
Trading Arrangement:
Trading Arrangement [Axis]
(Decrease) increase in taxes payable
Increase (Decrease) in Income Taxes Payable
Total Shareholder Return Amount
Total Shareholder Return Amount
Debentures due March 2035
Small Business Administration Debentures Due, March 2035 Pool [Member]
Small Business Administration Debentures Due, March 2035 Pool
Unrealized (depreciation) appreciation on investments
Investment Company, Distributable Earnings (Loss), Accumulated Appreciation (Depreciation)
PATRIOT INTERMEDIATE HOLDCO, LLC
PATRIOT INTERMEDIATE HOLDCO, LLC [Member]
PATRIOT INTERMEDIATE HOLDCO, LLC
Security Exchange Name
CHALET DESSERTS, LLC
CHALET DESSERTS, LLC [Member]
CHALET DESSERTS, LLC
Accumulated amortization
Accumulated Amortization, Debt Issuance Costs
BOND BRAND LOYALTY ULC
BOND BRAND LOYALTY ULC [Member]
BOND BRAND LOYALTY ULC
AMERICAN NUTS OPERATIONS LLC
AMERICAN NUTS OPERATIONS LLC, Equity Investments [Member]
AMERICAN NUTS OPERATIONS LLC, Equity Investments
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
ENSTOA, INC.
ENSTOA, INC. [Member]
ENSTOA, INC.
Per share market value at the end of the period (in usd per share)
Investment Company, Market Value, Per Share
Operating expenses:
Operating Expenses [Abstract]
Asset Class [Domain]
Asset Class [Domain]
THE GOBEL GROUP, LLC
THE GOBEL GROUP, LLC [Member]
THE GOBEL GROUP, LLC
Net periodic discount rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Realized & Unrealized Gains (Losses)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Change in restoration plan (in usd per share)
Investment Company, Change In Restoration Plan, Per Share
Investment Company, Change In Restoration Plan, Per Share
Statement [Line Items]
Statement [Line Items]
Other (in usd per share)
Investment Company, Other Adjustments Per Share
Investment Company, Other Adjustments Per Share
Unsecured Convertible Notes
Unsecured Convertible Notes [Member]
Unsecured Convertible Notes
INSTITUTES OF HEALTH, LLC
INSTITUTES OF HEALTH, LLC [Member]
INSTITUTES OF HEALTH, LLC
Proceeds from return of capital of investment in I-45 SLF LLC
Proceeds From Return Of Capital, Operating Activity
Proceeds From Return Of Capital, Operating Activity
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Cash and cash equivalents
Cash and Cash Equivalent
Fair Value Measurement Inputs and Valuation Techniques [Table]
Fair Value Measurement Inputs and Valuation Techniques [Table]
Subsequent Event [Line Items]
Subsequent Event [Line Items]
Number of shares increases in available for issuance (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized
Common Stock
Common Stock [Member]
Vested (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Subsidiary, Sale of Stock [Line Items]
Subsidiary, Sale of Stock [Line Items]
Net (decrease) increase in cash, cash equivalents and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Dividends cash paid (in usd per share)
Common Stock, Dividends, Per Share, Cash Paid
Net unrealized depreciation (appreciation) on investments before income tax
Unrealized Gain (Loss) on Investments
Maximum consideration threshold
Sale Of Stock, Maximum Consideration Threshold
Sale Of Stock, Maximum Consideration Threshold
O 2026 M3 Tax Year Dividends
O 2026 M3 Tax Year Dividends [Member]
O 2026 M3 Tax Year Dividends
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Significant Accounting Policies [Text Block]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Thereafter
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Accrued restoration plan liability
Accrued Restoration Plan Liability
Accrued Restoration Plan Liability
Realized loss on extinguishment of debt
Realized Gain (Loss) On Extinguishment Of Debt
Realized Gain (Loss) On Extinguishment Of Debt
Asset Class [Axis]
Asset Class [Axis]
Dividend income
Dividend Income, Operating, Paid in Cash
Weighted Average Remaining Vesting Term (in Years)
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Nonvested, Weighted Average Remaining Vesting Term [Abstract]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Nonvested, Weighted Average Remaining Vesting Term
Valuation Approach and Technique [Domain]
Valuation Approach and Technique [Domain]
Debt Issuance Costs, Equity Offering Costs, Earnings Per Share and Realized Losses on Extinguishment of Debt
Debt, Policy [Policy Text Block]
Gain Contingencies [Line Items]
Gain Contingencies [Line Items]
SUREKAP, LLC
SUREKAP, LLC [Member]
SUREKAP, LLC
REVO BRANDS, INC.
Revo Brands, INC [Member]
Revo Brands, INC
Income tax provision
Realized Gain (Loss), Investment and Derivative, Operating, Tax Expense (Benefit)
Pledged Status [Axis]
Pledged Status [Axis]
CATBIRD NYC, LLC
CATBIRD NYC, LLC, Equity Investments [Member]
CATBIRD NYC, LLC, Equity Investments
WELL LABS PLUS, LLC
WELL LABS PLUS, LLC [Member]
WELL LABS PLUS, LLC
ISLAND PUMP AND TANK, LLC
ISLAND PUMP AND TANK, LLC [Member]
ISLAND PUMP AND TANK, LLC
Healthcare Equipment & Supplies
Healthcare Equipment & Supplies Sector [Member]
Healthcare Equipment & Supplies Sector
Dividend income from wholly-owned subsidiary
Investment Company, Tax Basis Reconciliation, Dividend Income, Subsidiary, Increase (Decrease) In Taxable Income
Investment Company, Tax Basis Reconciliation, Dividend Income, Subsidiary, Increase (Decrease) In Taxable Income
Common stock withheld for payroll taxes upon vesting of restricted stock
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation
NATIONAL CREDIT CARE, LLC
NATIONAL CREDIT CARE, LLC, Equity Investments [Member]
NATIONAL CREDIT CARE, LLC, Equity Investments
Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Net increase in net assets from operations – basic (in usd per share)
Basic earnings per common share (in usd per share)
Net investment income per share – basic (in usd per share)
Earnings Per Share, Basic
Schedule of Credit Facilities
Schedule of Line of Credit Facilities [Table Text Block]
Minimum senior coverage ratio
Debt Instrument, Covenant, Senior Coverage Ratio, Minimum
Debt Instrument, Covenant, Senior Coverage Ratio, Minimum
Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]
Subsidiary or Equity Method Investee, Sale of Stock, Type [Table]
Total deferred tax asset
Deferred Tax Assets, Gross
Actuarial discount rate
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Discount Rate
Measurement Input, Discount Rate [Member]
Percentage of stock price
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger
Indenture Limited Protection Risk [Member]
Indenture Limited Protection Risk
Debentures due December 2034
Small Business Administration Debentures Due, December 2034 Pool [Member]
Small Business Administration Debentures Due, December 2034 Pool
Undistributed ordinary income - tax basis
Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss)
EBITDA Multiple
Measurement Input, EBITDA Multiple [Member]
STUDENT RESOURCE CENTER LLC
STUDENT RESOURCE CENTER LLC [Member]
STUDENT RESOURCE CENTER LLC
Measurement Input Type [Domain]
Measurement Input Type [Domain]
YTD Unrealized Appreciation (Depreciation) on Investments held at period end
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)
Leverage Risk [Member]
Leverage Risk
ARBORWORKS, LLC
ARBORWORKS, LLC, Equity Investments [Member]
ARBORWORKS, LLC, Equity Investments
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
AMERICAN NUTS OPERATIONS LLC
AMERICAN NUTS OPERATIONS LLC [Member]
AMERICAN NUTS OPERATIONS LLC
WHITE PLAINS LINEN LLC
WHITE PLAINS LINEN LLC [Member]
WHITE PLAINS LINEN LLC
Ordinary income
Investment Company, Distribution, Ordinary Income
Share-based compensation
Share-based compensation expense
Share-Based Payment Arrangement, Expense
August 2028 Notes
August 2028 Notes [Member]
August 2028 Notes
Total increase (decrease) from investment operations (in usd per share)
Investment Company, Investment Income (Loss) from Operations, Per Share
Total liabilities and net assets
Liabilities and Equity
Unfunded Equity Commitments
Financial Support, Capital Contributions [Member]
Cancellation of treasury stock (in shares)
Treasury Stock, Shares, Cancelled
Treasury Stock, Shares, Cancelled
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
March 31, 2023 supplemental
S 2023 Q1 Tax Year Dividends [Member]
S 2023 Q1 Tax Year Dividends
Competitive Market Risk [Member]
Competitive Market Risk
Consecutive trading days
Debt Instrument, Convertible, Threshold Consecutive Trading Days
Healthcare Laws And Other Regulation Risk [Member]
Healthcare Laws And Other Regulation Risk
ITA HOLDINGS GROUP, LLC
ITA HOLDINGS GROUP, LLC, Equity Investments [Member]
ITA HOLDINGS GROUP, LLC, Equity Investments
Debentures due September 2033
Small Business Administration Debentures, Due September 2033 [Member]
Small Business Administration Debentures, Due September 2033
December 31, 2023
O 2023 Q4 Tax Year Dividends [Member]
O 2023 Q4 Tax Year Dividends
Accounting Policies [Abstract]
BROAD SKY NETWORKS LLC
BROAD SKY NETWORKS LLC [Member]
BROAD SKY NETWORKS LLC
ARMKO, LLC
ARMKO, LLC [Member]
ARMKO, LLC
AAC NEW HOLDCO INC.
AAC NEW HOLDCO INC. [Member]
AAC NEW HOLDCO INC.
Schedule of Future Minimum Payments
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
SBIC I
SBIC I [Member]
SBIC I
First lien loans
Debt Securities, First Lien [Member]
Debt Securities, First Lien [Member]
Treasury Stock
Treasury Stock, Common [Member]
Pay vs Performance Disclosure [Line Items]
Operating lease liability
Operating Lease, Liability
Liabilities
Liabilities [Abstract]
Compensation related book/tax differences
Investment Company, Tax Basis Reconciliation, Compensation Related Differences, Increase (Decrease) In Taxable Income
Investment Company, Tax Basis Reconciliation, Compensation Related Differences, Increase (Decrease) In Taxable Income
Interest expense and fees
Interest Expense And Unused Commitment Fees
Interest Expense And Unused Commitment Fees
Weighted average interest rate
Long-Term Debt, Weighted Average Interest Rate, over Time
ROSELAND MANAGEMENT, LLC
ROSELAND MANAGEMENT, LLC [Member]
ROSELAND MANAGEMENT, LLC
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]
NATIONAL CREDIT CARE, LLC
NATIONAL CREDIT CARE, LLC [Member]
NATIONAL CREDIT CARE, LLC
Increase in dividend and interest receivable
Increase (Decrease) in Interest and Dividends Receivable
Dividend Risk [Member]
Dividend Risk
Statement of Cash Flows [Abstract]
Company Selected Measure Amount
Company Selected Measure Amount
2029
Lessee, Operating Lease, Liability, to be Paid, Year Three
Measurement Input Type [Axis]
Measurement Input Type [Axis]
Asset Coverage Requirement Risk [Member]
Asset Coverage Requirement Risk
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC (FKA ROOF OPCO, LLC)
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC [Member]
APPLE ROOFING ADMINISTRATIVE SERVICES, LLC
Investment, Issuer Affiliation [Axis]
Investment, Issuer Affiliation [Axis]
Name
Measure Name
SPV Credit Facility
SPV Credit Facility
Secured Debt [Member]
Accretive (dilutive) effect of share issuances and repurchases (in usd per share)
Investment Company, Accretive Effect Of Share Issuances And Repurchases, Per Share
Investment Company, Accretive Effect Of Share Issuances And Repurchases, Per Share
Industry Sector [Domain]
Industry Sector [Domain]
Deferred tax liability
Deferred Income Tax Liabilities, Net
Non-Employee Director Plan
Non-Employee Director Plan [Member]
Non-Employee Director Plan
Unsecured Debt
Unsecured Debt [Member]
Cost
Measurement Input, Cost [Member]
Measurement Input, Cost
Realized (gain) loss book/tax differences
Investment Company, Tax Basis Reconciliation, Loss (Gain) Recognized On Dispositions, Increase (Decrease) In Taxable Income
Investment Company, Tax Basis Reconciliation, Loss (Gain) Recognized On Dispositions, Increase (Decrease) In Taxable Income
Income Tax Contingency [Table]
Income Tax Contingency [Table]
Recorded Value
Long-Term Debt
Legal Entity [Axis]
Third Party Broker Quote
Measurement Input, Quoted Price [Member]
Total assets
Assets
Vested (in usd per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Total
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax
2010 Plan and 2021 Employee Plan
2010 Plan And 2021 Employee Plan [Member]
2010 Plan And 2021 Employee Plan
Geographical [Domain]
Geographical [Domain]
Regular Dividends
O 2026 Q4 Dividends [Member]
O 2026 Q4 Dividends
Federal Income Taxes and Deferred Taxes
Income Tax, Policy [Policy Text Block]
Other
Other Tax Expense (Benefit)
NINJATRADER, LLC
NINJATRADER, LLC [Member]
NINJATRADER, LLC
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
STATINMED, LLC
STATINMED, LLC [Member]
STATINMED, LLC
Escrow Receivable
Escrow Receivable Policy [Policy Text Block]
Escrow Receivable Policy
Income taxes (in usd per share)
Investment Company, Investment Income (Loss), Taxes, Per Share
Investment Company, Investment Income (Loss), Taxes, Per Share
Dividends declared (in usd per share)
Common Stock, Dividends, Per Share, Declared
Entity Common Stock, Shares Outstanding
2030
Financial Commitment Year Five [Member]
Financial Commitment Year Five
Principal
Principal Amount - Debt Investments
Investment Owned, Balance, Principal Amount
Data Processing & Outsourced Services
Data Processing & Outsourced Services Sector [Member]
Data Processing & Outsourced Services Sector
Significant Other Observable Inputs (Level 2)
Fair Value, Inputs, Level 2 [Member]
Document Financial Statement Error Correction [Flag]
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Movies & Entertainment
Movies & Entertainment Sector [Member]
Movies & Entertainment Sector
MID-FLORIDA ENDODONTICS MANAGEMENT COMPANY, LLC
MID-FLORIDA ENDODONTICS MANAGEMENT COMPANY, LLC [Member]
MID-FLORIDA ENDODONTICS MANAGEMENT COMPANY, LLC
Asset Pledged as Collateral
Asset Pledged as Collateral [Member]
Components of distributable earnings at year-end
Distributable Earnings, Tax Basis
Distributable Earnings, Tax Basis
Schedule of Significant Components of Income Tax Provision
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Plan Name [Axis]
Plan Name [Axis]
BP LOENBRO HOLDINGS INC.
BP LOENBRO HOLDINGS INC. [Member]
BP LOENBRO HOLDINGS INC.
Maximum asset coverage ratio
Debt Instrument, Covenant, Regulatory Asset Coverage Ratio, Minimum
Debt Instrument, Covenant, Regulatory Asset Coverage Ratio, Minimum
PEO
PEO [Member]
Shareholder Dilution Risk [Member]
Shareholder Dilution Risk
Portfolio investments sold
Proceeds from Sale, Maturity and Collection of Investments
MERCURY ACQUISITION 2021, LLC
MERCURY ACQUISITION 2021, LLC, Equity Investments [Member]
MERCURY ACQUISITION 2021, LLC, Equity Investments
Earnout
Earnout [Member]
Earnout
Accordion feature that allows increases (up to)
Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option
Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option
Proceeds from issuance of August 2028 Notes
Proceeds from Issuance of Medium-Term Note
Floor
Investment, Interest Rate, Floor
Total Distributable Earnings (Loss)
Total distributable earnings
Retained Earnings [Member]
June 30, 2024 supplemental
S 2024 Q2 Tax Year Dividends [Member]
S 2024 Q2 Tax Year Dividends
Schedule of Quarterly Financial Information
Quarterly Financial Information [Table Text Block]
Investment income (in usd per share)
Investment Company, Investment Income (Loss), Gross, Per Share
Investment Company, Investment Income (Loss), Gross, Per Share
Share-Based Payment Arrangement [Abstract]
Cash, cash equivalents and restricted cash at beginning of period
Cash, cash equivalents and restricted cash at end of period
Total cash, cash equivalents and restricted cash presented in the Consolidated Statements of Cash Flows
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Income Statement [Abstract]
Sale of Stock [Domain]
Sale of Stock [Domain]
Total Investments
Investments, Fair Value Disclosure
Healthcare Services
Healthcare Services Sector [Member]
Healthcare Services Sector
Total return based on change in NAV
Investment Company, Total Return
Settlement Or Conversion Risk [Member]
Settlement Or Conversion Risk
Interest expense
Interest Expense, Debt, Excluding Amortization
Exercise of employee stock options (in usd per share)
Investment Company, Exercise Of Employee Stock Options, Per Share
Investment Company, Exercise Of Employee Stock Options, Per Share
Net increase in net assets from operations per share - diluted (in usd per share)
Income (Loss) from Continuing Operations, Per Diluted Share
Income before taxes
Net Investment Income
Net actuarial gain recognized as a component of equity
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Changes in other assets and liabilities:
Change in Contract with Customer, Asset and Liability [Abstract]
December 31, 2024
O 2024 Q4 Tax Year Dividends [Member]
O 2024 Q4 Tax Year Dividends
ARBORWORKS, LLC
ARBORWORKS, LLC [Member]
ARBORWORKS, LLC
Dividends to shareholders
Investment Company, Dividend Distribution
Tax (benefit) provision related to Taxable Subsidiary
Income Tax Expense (Benefit) From Subsidiaries
Income Tax Expense (Benefit) From Subsidiaries
O 2026 M2 Tax Year Dividends
O 2026 M2 Tax Year Dividends [Member]
O 2026 M2 Tax Year Dividends
City Area Code
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
Percent of total assets
Investment Owned, Percent Of Total Assets
Investment Owned, Percent Of Total Assets
Borrowings under Credit Facilities
Proceeds from Long-Term Lines of Credit
Total net deferred tax (liabilities) assets
Total net deferred tax (liabilities) assets
Deferred Tax Liabilities, Net
SHEARWATER RESEARCH, INC.
Shearwater Research, Inc. [Member]
Shearwater Research, Inc.
Cash flows from investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
General and administrative
General and Administrative Expense
ONE GROUP, LLC
ONE GROUP, LLC [Member]
ONE GROUP, LLC
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Employer matching contribution (up to)
Defined Contribution Plan, Employer Matching Contribution, Percent of Match
Cybersecurity Systems Risk [Member]
Cybersecurity Systems Risk
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Amortization Of Gain (Loss), Statement of Income or Comprehensive Income Extensible List Not Disclosed Flag
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Amortization Of Gain (Loss), Statement of Income or Comprehensive Income Extensible List Not Disclosed Flag
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Amortization Of Gain (Loss), Statement of Income or Comprehensive Income Extensible List Not Disclosed Flag
Related Party Transactions [Abstract]
Net amortization
Defined Benefit Plan, Amortization of Gain (Loss)
Other liabilities
Other Liabilities
FS VECTOR LLC
FS VECTOR LLC [Member]
FS VECTOR LLC
Interest
Deferred Tax Asset, Interest Carryforward
Income tax receivable
Income Taxes Receivable
Other temporary differences
Investment Company, Distributable Earnings (Loss), Accumulated Temporary Difference, Other
Contribution percentage in non-qualified assets
Investment Company, Investment Owned, Non-Qualified Assets, Percent Of Net Assets
Investment Company, Investment Owned, Non-Qualified Assets, Percent Of Net Assets
International
Non-US [Member]
Auditor Name
CATBIRD NYC, LLC
CATBIRD NYC, LLC [Member]
CATBIRD NYC, LLC
Concentration Risk [Table]
Concentration Risk [Table]
Active Market Risk [Member]
Active Market Risk
Schedule of Per Share Data
Investment Company, Financial Highlights [Table Text Block]
SPHERIX GLOBAL INSIGHTS US, INC.
SPHERIX GLOBAL INSIGHTS US, INC. [Member]
SPHERIX GLOBAL INSIGHTS US, INC.
INDINERO GROUP, INC.
INDINERO GROUP, INC. [Member]
INDINERO GROUP, INC.
Other Performance Measure, Amount
Other Performance Measure, Amount
Debt issuance costs paid
Payments of Debt Issuance Costs
Ratio of net investment income to average net assets
Investment Company, Investment Income (Loss) Ratio
Cost of investments
Investment, Tax Basis, Cost
Fair Value Measurements
Fair Value Measurement, Policy [Policy Text Block]
Related Party [Domain]
Related and Nonrelated Parties [Domain]
2029 Convertible Notes
2029 Convertible Notes [Member]
2029 Convertible Notes
Common equity & warrants
Common equity & warrants
Common Equity & Warrants [Member]
Common Equity & Warrants [Member]
Healthcare Products
Healthcare Products Sector [Member]
Healthcare Products Sector
Credit risk
Credit Concentration Risk [Member]
September 30, 2024 supplemental
S 2024 Q3 Tax Year Dividends [Member]
S 2024 Q3 Tax Year Dividends
Restricted cash
Restricted Cash
Schedule of Amounts Recognized in Consolidated Statements of Assets and Liabilities
Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]
O 2026 M4 Tax Year Dividends
O 2026 M4 Tax Year Dividends [Member]
O 2026 M4 Tax Year Dividends
Entity [Domain]
ACACIA BUYERCO V LLC
ACACIA BUYERCO V LLC, Equity Securities [Member]
ACACIA BUYERCO V LLC, Equity Securities
Net cash used in investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
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]
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activity
Document Fiscal Year Focus
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Operating lease asset
Operating Lease, Right-of-Use Asset
MONROE BIOMEDICAL RESEARCH, LLC
MONROE BIOMEDICAL RESEARCH, LLC [Member]
MONROE BIOMEDICAL RESEARCH, LLC
December 31, 2025 supplemental
S 2025 M12 Tax Year Dividends [Member]
S 2025 M12 Tax Year Dividends
Initial equity capital commitment
Investment Company, Committed Capital
Plan Name [Domain]
Plan Name [Domain]
ZENFOLIO INC.
ZENFOLIO INC [Member]
ZENFOLIO INC
Weighted-average vesting period
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Net realized and unrealized (losses) gains on investments
Gain (Loss), Investment and Derivative, Operating, after Tax
Portfolio Control Risk [Member]
Portfolio Control Risk
Capital loss carryover
Investment Company, Distributable Earnings (Loss), Accumulated Capital Loss Carryforward
Equity [Abstract]
Compliance Risk [Member]
Compliance Risk
September 30, 2025
O 2025 M9 Tax Year Dividends [Member]
O 2025 M9 Tax Year Dividends
Office Space
Building [Member]
RODIZIO OPCO LLC
RODIZIO OPCO LLC [Member]
RODIZIO OPCO LLC
Information Systems Dependency Risk [Member]
Information Systems Dependency Risk
West
US West Region [Member]
Investment Type
Investment Type Concentration Risk [Member]
Investment Type Concentration Risk
Debt Obligation Covenants Risk [Member]
Debt Obligation Covenants Risk
DWS BUYER LLC
DWS BUYER LLC [Member]
DWS BUYER LLC
VP MOVE PURCHASER, INC.
VP MOVE PURCHASER, INC [Member]
VP MOVE PURCHASER, INC
Other Commitments [Line Items]
Other Commitments [Line Items]
HH-INSPIRE ACQUISITION, INC.
HH-INSPIRE ACQUISITION, INC. [Member]
HH-INSPIRE ACQUISITION, INC.
Debt Instrument, Rate Period [Domain]
Debt Instrument, Rate Period [Domain]
Debt Instrument Term [Domain]
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Weighted Average
Weighted Average [Member]
Leases
Lessee, Leases [Policy Text Block]
Depreciation and amortization
Depreciation, Depletion and Amortization
(Increase) decrease in tax receivable
Increase (Decrease) in Income Taxes Receivable
Conversion rate
Debt Instrument, Convertible, Conversion Ratio
Other Financial Instruments
Other Financial Instruments [Member]
Other Financial Instruments
AMERICAN PET RESORT, LLC
AMERICAN PET RESORT, LLC [Member]
AMERICAN PET RESORT, LLC
Regulatory Risk [Member]
Regulatory Risk
Net proceeds received
Sale of Stock, Consideration Received on Transaction
Adjustment for dilutive effect of 2029 Convertible Notes
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities
Debentures due September 2032
Small Business Administration Debentures, Due September 2032 [Member]
Small Business Administration Debentures, Due September 2032
Credit Facility Default Risk [Member]
Credit Facility Default Risk
Corporate Credit Facility
Revolving Loans
Revolving Credit Facility [Member]
Realized loss on disposal of fixed assets
Deferred Debt Issuance Cost, Writeoff
Spin-off Compensation Plan Distribution, net of tax (in usd per share)
Investment Company, Spin-off Compensation Plan Distribution, Net Of Tax, Per Share
Investment Company, Spin-off Compensation Plan Distribution, Net Of Tax, Per Share
Arrangement Duration
Trading Arrangement Duration
LKC TECHNOLOGIES, INC.
LKC TECHNOLOGIES, INC. [Member]
LKC TECHNOLOGIES, INC.
Investment, Issuer Name [Domain]
Investment, Issuer Name [Domain]
Local Phone Number
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
SBIC II
SBIC II [Member]
SBIC II
Second lien loans
Debt Securities, Second Lien [Member]
Debt Securities, Second Lien
Interest Rate Exposure Risk [Member]
Interest Rate Exposure Risk
Closing stock price at issuance (in usd per share)
Thereafter
Long-Term Debt, Maturity, after Year Five
STOCK BASED COMPENSATION PLANS
Share-Based Payment Arrangement [Text Block]
June 30, 2023 supplemental
S 2023 Q2 Tax Year Dividends [Member]
S 2023 Q2 Tax Year Dividends
Fair Value
Investments, Fair Value Disclosure [Abstract]
Environmental, Social And Governance Risk [Member]
Environmental, Social And Governance Risk
ACCELERATION PARTNERS, LLC
ACCELERATION PARTNERS, LLC, Equity Investments [Member]
ACCELERATION PARTNERS, LLC, Equity Investments
Assets
Assets [Abstract]
Proceeds from issuance of SBA Debentures
Proceeds from Issuance of Unsecured Debt
Issuance of restricted stock (in usd per share)
Investment Company, Share Issuance, Per Share
Credit Facility [Axis]
Credit Facility [Axis]
Gross Additions
Investments in and Advances to Affiliates, at Fair Value, Gross Additions
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
ITA HOLDINGS GROUP, LLC
ITA Holdings Group, LLC [Member]
ITA Holdings Group, LLC
Default Payment Risk [Member]
Default Payment Risk
Net pension cost
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Debt Instrument [Axis]
Dividend increase (in usd per share)
Debt Instrument, Convertible, Per Share Dividend Threshold
Debt Instrument, Convertible, Per Share Dividend Threshold
Forfeited (in usd per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Interest Income and Payment-in-Kind Interest
Revenue Recognition, Interest [Policy Text Block]
RETIREMENT PLANS
Retirement Benefits [Text Block]
FAIR VALUE MEASUREMENTS
Fair Value Disclosures [Text Block]
Realized loss on extinguishment of debt
Gain (Loss) on Extinguishment of Debt
Credit Facility [Domain]
Credit Facility [Domain]
Net unrealized (depreciation) appreciation on investments
Debt and Equity Securities, Unrealized Gain (Loss)
Net Assets
Equity, Attributable to Parent [Abstract]
Percentage of Net Assets at Fair Value
Investment Owned, Net Assets, Percentage
Operating expenses (in usd per share)
Investment Company, Investment Income (Loss), Operating Expenses, Per Share
Investment Company, Investment Income (Loss), Operating Expenses, Per Share
December 31, 2025
O 2025 Q12 Tax Year Dividends [Member]
O 2025 Q12 Tax Year Dividends
Fixed interest rate (in percent)
Fixed Interest Rate
Debt Instrument, Interest Rate, Stated Percentage
Investment, Name [Axis]
Investment, Name [Axis]
Media & Marketing
Media And Marketing Sector [Member]
Media And Marketing Sector
Entity Voluntary Filers
Investment Company [Abstract]
Number of revolving credit facility
Number Of Revolving Credit Facility
Number Of Revolving Credit Facility
SUMMARY OF PER SHARE INFORMATION
Investment Company, Financial Highlights [Text Block]
Entity Registrant Name
Discount rate
Lessee, Operating Lease, Discount Rate
MUENSTER MILLING COMPANY, LLC
MUENSTER MILLING COMPANY, LLC [Member]
MUENSTER MILLING COMPANY, LLC
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Net pension cost from restoration plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Payment-in-kind interest income:
Interest Income, Paid-in-kind [Abstract]
Interest Income, Paid-in-kind
September 30, 2023
O 2023 Q3 Tax Year Dividends [Member]
O 2023 Q3 Tax Year Dividends
DYNAMIC COMMUNITIES, LLC
DYNAMIC COMMUNITIES, LLC, Equity Securities [Member]
DYNAMIC COMMUNITIES, LLC, Equity Securities
Interest coverage ratio
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum
Number of operating segments
Number of Operating Segments
Energy Services
Energy Services (Midstream) Sector [Member]
Energy Services (Midstream) Sector
June 30, 2023
O 2023 Q2 Tax Year Dividends [Member]
O 2023 Q2 Tax Year Dividends
Accretion of discounts on investments
Accretion (Amortization) of Discounts and Premiums, Investments
Ratios and Supplemental Data
Investment Company, Ratio To Average Net Assets And Supplemental Data [Abstract]
Investment Company, Ratio To Average Net Assets And Supplemental Data [Abstract]
Amount of Realized Gain/(Loss)
Investments In And Advances To Affiliates, At Fair Value, Realized Change In Fair Value
Investments In And Advances To Affiliates, At Fair Value, Realized Change In Fair Value
Schedule of Borrowings Outstanding
Schedule of Debt [Table Text Block]
Interest cost on projected benefit obligation
Interest cost
Defined Benefit Plan, Interest Cost
Granted (in usd per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Related Party [Axis]
Related and Nonrelated Parties [Axis]
Food, Agriculture & Beverage
Food, Agriculture And Beverage Sector [Member]
Food, Agriculture & Beverage Sector
Expiration Period [Axis]
Expiration Period [Axis]
Expiration Period
Repayments of Credit Facilities
Repayments of Long-Term Lines of Credit
Restatement Determination Date:
Restatement Determination Date [Axis]
BETTER THAN HOME, INC.
BETTER THAN HOME, INC. [Member]
BETTER THAN HOME, INC.
Tax Qualification Risk [Member]
Tax Qualification Risk
Ownership percent
Investment Owned, Balance, Percent Of Shares
Investment Owned, Balance, Percent Of Shares
Debentures due March 2032
Small Business Administration Debentures, Due March 2032 [Member]
Small Business Administration Debentures, Due March 2032
Total interest and amortization of deferred financing costs
Interest Expense, Debt
December 2022 Notes [Member]
December 2022 Notes
UNWIRED BROADBAND, LLC
UNWIRED BROADBAND, LLC [Member]
UNWIRED BROADBAND, LLC
POOL SERVICE PARTNERS, INC.
POOL SERVICE PARTNERS, INC [Member]
POOL SERVICE PARTNERS, INC
Name
Trading Arrangement, Individual Name
Total Unfunded Debt Commitments
Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount
IGNITE VISIBILITY LLC
IGNITE VISIBILITY LLC, Equity Interest [Member]
IGNITE VISIBILITY LLC, Equity Interest
Aggregate principal amount
Debt Instrument, Face Amount
Net realized gain (loss) on investments, extinguishment of debt and disposal of fixed assets
Realized Gain (Loss) On Investments, Extinguishment Of Debt And Disposal Of Fixed Assets
Realized Gain (Loss) On Investments, Extinguishment Of Debt And Disposal Of Fixed Assets
MUENSTER MILLING COMPANY, LLC
MUENSTER MILLING COMPANY, LLC, Equity Investments [Member]
MUENSTER MILLING COMPANY, LLC, Equity Investments
September 30, 2023 supplemental
S 2023 Q3 Tax Year Dividends [Member]
S 2023 Q3 Tax Year Dividends
Total distributions (in percent)
Investment Company, Ordinary Interest Related Distributions, Percentage
Investment Company, Ordinary Interest Related Distributions, Percentage
Share Repurchase Program [Axis]
Share Repurchase Program [Axis]
Preferred equity
Preferred Stock [Member]
CADMIUM, LLC
CADMIUM, LLC [Member]
CADMIUM, LLC
Investment, Issuer Affiliation [Domain]
Investment, Issuer Affiliation [Domain]
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Beginning balance (in usd per share)
Ending balance (in usd per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Ratio of operating expenses (excluding interest expense) to average net assets
Investment Company, Expense Ratio, Excluding Interest, After Fee Waiver And Incentive Fee Deduction
Investment Company, Expense Ratio, Excluding Interest, After Fee Waiver And Incentive Fee Deduction
Escrow
Escrow Deposit
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Small Business Administration Debentures Due, March 2026
Small Business Administration Debentures, March 2026 Pool [Member]
Small Business Administration Debentures, March 2026 Pool
ICFR Auditor Attestation Flag
2010 Plan
2010 Plan [Member]
2010 Plan
Share-based compensation
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Regulatory Restriction Risk [Member]
Regulatory Restriction Risk
Excise tax
Excise and Sales Taxes
LIGHTNING INTERMEDIATE II, LLC
LIGHTNING INTERMEDIATE II, LLC [Member]
LIGHTNING INTERMEDIATE II, LLC
Auditor Firm ID
Benefit obligation at beginning of year
Benefit obligation at end of year
Projected benefit obligation
Defined Benefit Plan, Benefit Obligation
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
LIGHTING RETROFIT INTERNATIONAL, LLC
LIGHTING RETROFIT INTERNATIONAL, LLC [Member]
LIGHTING RETROFIT INTERNATIONAL, LLC
Net unrealized appreciation on investments
Deferred Tax Liabilities, Investments
PYRAMIDS ACQUISITION, LLC
PYRAMIDS ACQUISITION, LLC [Member]
PYRAMIDS ACQUISITION, LLC
Investments in and Advances to Affiliates [Table]
Investments in and Advances to Affiliates [Table]
Qualified Personnel Attraction And Retention Risk [Member]
Qualified Personnel Attraction And Retention Risk
Subordinated debt
Subordinated Debt [Member]
All Executive Categories
All Executive Categories [Member]
Schedule of Deferred Tax Assets and Liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Common stock, $0.25 par value: authorized, 75,000,000 shares at March 31, 2026 and March 31, 2025; issued, 60,577,181 shares at March 31, 2026 and 52,912,796 shares at March 31, 2025
Common Stock, Value, Issued
Adjustment for income allocated to participating securities
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic
Schedule of Convertible Debt
Convertible Debt [Table Text Block]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Downgrades To U.S. Credit Rating, Automatic Spending Cuts, Or Government Shutdown Risk [Member]
Downgrades To U.S. Credit Rating, Automatic Spending Cuts, Or Government Shutdown Risk
Common stock withheld for payroll taxes upon vesting of restricted stock (in usd per share)
Investment Company, Common Stock Withheld For Payroll Taxes Upon Vesting Of Restricted Stock, Per Share
Investment Company, Common Stock Withheld For Payroll Taxes Upon Vesting Of Restricted Stock, Per Share
Commitments and contingencies (Note 12)
Commitments and Contingencies
LOCAL WEB LEADS, LLC
LOCAL WEB LEADS, LLC [Member]
LOCAL WEB LEADS, LLC
2021 Employee Plan
2021 Employee Plan [Member]
2021 Employee Plan
ROSELAND MANAGEMENT, LLC
ROSELAND MANAGEMENT, LLC, Equity Investments [Member]
ROSELAND MANAGEMENT, LLC, Equity Investments
Significant Level 3 Inputs
Investment Company, Investment Owned, Measurement Input
Schedule of Unfunded Debt
Investment Company, Schedule Of Unfunded Debt Commitments [Table Text Block]
Investment Company, Schedule Of Unfunded Debt Commitments
Significant Unobservable Inputs
Investments Fair Value Disclosure, Measurement Input [Abstract]
Investments Fair Value Disclosure, Measurement Input [Abstract]
Concentration Risk [Line Items]
Concentration Risk [Line Items]
IVUEIT, LLC
IVUEIT, LLC [Member]
IVUEIT, LLC
Structurally Subordinated Note Risk [Member]
Structurally Subordinated Note Risk
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Net unrealized (depreciation) appreciation on investments, net of tax (in usd per share)
Investment Company, Net Unrealized (Depreciation) Appreciation On Investments, Net Of Tax, Per Share
Investment Company, Net Unrealized (Depreciation) Appreciation On Investments, Net Of Tax, Per Share
OTHER EMPLOYEE COMPENSATION
Defined Contribution Plan [Text Block]
Proceeds from common stock offering
Proceeds from Issuance of Common Stock
2031
Defined Benefit Plan, Expected Future Benefit Payment, Year Five
NEUROPSYCHIATRIC HOSPITALS, LLC
NEUROPSYCHIATRIC HOSPITALS, LLC [Member]
NEUROPSYCHIATRIC HOSPITALS, LLC
Term of service
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period
Cash Payment Settlement Or Conversion Risk [Member]
Cash Payment Settlement Or Conversion Risk
All Individuals
All Individuals [Member]
Long-Term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Fair Value Disclosures [Abstract]
Distributions on tax basis
Investment Company, Tax Dividend Distribution
Investment Company, Tax Dividend Distribution
Acquisition of fixed assets
Payments to Acquire Property, Plant, and Equipment
Name
Forgone Recovery, Individual Name
Dividends to shareholders (in usd per share)
Investment Company, Distribution to Shareholders, Per Share
AIR CONDITIONING SPECIALIST INC.
Air Conditioning Specialist, Inc. [Member]
Air Conditioning Specialist, Inc.
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]
ZIPS CAR WASH, LLC
ZIPS CAR WASH, LLC [Member]
ZIPS CAR WASH, LLC
Total cash, cash equivalents and restricted cash presented in the Consolidated Statements of Cash Flows
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract]
Unsecured, Subordinated Note Risk [Member]
Unsecured, Subordinated Note Risk
Corporate Credit Facility
Corporate Credit Facility [Member]
Corporate Credit Facility
Pre-tax net investment income per share - basic (in usd per share)
Investment Company, Net Investment Income Before Taxes, Per Basic Share
Investment Company, Net Investment Income Before Taxes, Per Basic Share
Percent of assets
Assets, Percent
Assets, Percent
Proceeds from issuance of September 2030 Notes
Proceeds from Notes Payable
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
O 2026 M5 Tax Year Dividends
O 2026 M5 Tax Year Dividends [Member]
O 2026 M5 Tax Year Dividends
Line of Credit Facility [Line Items]
Line of Credit Facility [Line Items]
CAVALIER BUYER, INC.
CAVALIER BUYER, INC [Member]
CAVALIER BUYER, INC
Dividend income:
Dividend Income, Operating [Abstract]
Geographical [Axis]
Geographical [Axis]
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
Quarterly Financial Information [Text Block]
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Schedule of Shares Sold
Schedule of Sale of Stock by Subsidiary or Equity Method Investee Disclosure [Table Text Block]
Qualifying Assets Failure To Qualify Risk [Member]
Qualifying Assets Failure To Qualify Risk
CapTrin Partners, LLC
CapTrin Partners, LLC [Member]
CapTrin Partners, LLC
Net operating income - wholly-owned subsidiary
Investment Company, Tax Basis Reconciliation, Net Operating Income, Subsidiary, Increase (Decrease) In Taxable Income
Investment Company, Tax Basis Reconciliation, Net Operating Income, Subsidiary, Increase (Decrease) In Taxable Income
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Title of 12(b) Security
Senior Loans Risk [Member]
Senior Loans Risk
Payment of accrued payment-in-kind interest
Paid-in-Kind Interest
Earnings Per Share [Abstract]
Net investment income
Net investment income
Net investment income
Investment Income, Operating, after Expense and Tax
2031
Lessee, Operating Lease, Liability, to be Paid, Year Five
OUTERBOX, LLC
OUTERBOX, LLC Equity Interest [Member]
OUTERBOX, LLC Equity Interest
CRAFTY APES, LLC
CRAFTY APES, LLC [Member]
CRAFTY APES, LLC
360 QUOTE TOPCO, LLC
360 QUOTE TOPCO, LLC [Member]
360 QUOTE TOPCO, LLC
Net realized loss on investments and extinguishment of debt
Net Realized Loss On Investments And Extinguishment Of Debt
Net Realized Loss On Investments And Extinguishment Of Debt
April 2027
Expiration Tranche Three [Member]
Expiration Tranche Three
Technology Products & Components
Technology Products & Components [Member]
Technology Products & Components
Qualifying assets
Investment Company, Percent Of Qualified Assets
Investment Company, Percent Of Qualified Assets
Quarterly Financial Information Disclosure [Abstract]
SOCIALSEO, LLC
SOCIALSEO, LLC [Member]
SOCIALSEO, LLC
Industry
Industry Concentration Risk [Member]
Industry Concentration Risk
Net unrealized (depreciation) appreciation on investments
Unrealized Investment Gains Losses [Abstract]
Unrealized Investment Gains Losses
PIPELINE TECHNIQUE LTD.
PIPELINE TECHNIQUE LTD. [Member]
PIPELINE TECHNIQUE LTD.
Fee income:
Fee Income [Abstract]
Fee Income
LGM PHARMA, LLC
LGM PHARMA, LLC [Member]
LGM PHARMA, LLC
Political, Social And Economic Uncertainty Risk [Member]
Political, Social And Economic Uncertainty Risk
Capital Markets Disruptions And Economic Uncertainty Risk [Member]
Capital Markets Disruptions And Economic Uncertainty Risk
Expiration Tranche [Domain]
Expiration Tranche [Domain]
Expiration Tranche [Domain]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total income tax provision
Investment Income, Operating, Tax Expense (Benefit)
Award Timing Disclosures [Line Items]
Total net realized gain (loss) on investments, net of tax
Net realized gain (loss) on investments, net of tax
Realized Gain (Loss), Investment and Derivative, Operating, after Tax
SHAREHOLDERS' EQUITY
Equity [Text Block]
Net unrealized depreciation (appreciation) on investments
Investment Company, Tax Basis, Unrealized (Gain) Loss, Not Currently (Taxable) Deductible
Net increase in net assets from operations
Net increase in net assets from operations
Numerator for basic earnings per share
Net increase in net assets from operations
Net Income (Loss) Attributable to Parent
Subsequent Event [Table]
Subsequent Event [Table]
Subsidiary or Equity Method Investee [Line Items]
Subsidiary or Equity Method Investee [Line Items]
June 30, 2024
O 2024 Q2 Tax Year Dividends [Member]
O 2024 Q2 Tax Year Dividends
CAMPANY ROOF MAINTENANCE, LLC
CAMPANY ROOF MAINTENANCE, LLC [Member]
CAMPANY ROOF MAINTENANCE, LLC
Vesting period (in years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
CENTRAL MEDICAL SUPPLY LLC
CENTRAL MEDICAL SUPPLY LLC [Member]
CENTRAL MEDICAL SUPPLY LLC
Adoption Date
Trading Arrangement Adoption Date
Presentation
Reclassification, Comparability Adjustment [Policy Text Block]
Leverage commitment amount
Debt Instrument, Leverage Commitment Amount
Debt Instrument, Leverage Commitment Amount
Investment interest rate
Investment Interest Rate
Loss on extinguishment of debt
Investment Company, Tax Basis Reconciliation, Loss On Extinguishment of Debt, Increase (Decrease) In Taxable Income
Investment Company, Tax Basis Reconciliation, Loss On Extinguishment of Debt, Increase (Decrease) In Taxable Income
Enterprise Value Waterfall Approach
Valuation, Enterprise Value Waterfall Approach [Member]
Valuation, Enterprise Value Waterfall Approach
Line of Credit
Line of Credit [Member]
Total distributable (loss) earnings
Retained Earnings (Accumulated Deficit)
Schedule of Share Repurchases
Class of Treasury Stock [Table Text Block]
CLEARWATER GROUP, LLC
CLEARWATER GROUP, LLC [Member]
CLEARWATER GROUP, LLC
O 2027 Q1 Dividends
O 2027 Q1 Dividends [Member]
O 2027 Q1 Dividends
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]
Redemption of notes
Repayments of Medium-Term Note
2031
Financial Commitment Year Six [Member]
Financial Commitment Year Six
Incremental compensation cost
Share-Based Payment Arrangement, Plan Modification, Incremental Cost
FOOD PHARMA SUBSIDIARY HOLDINGS, LLC
FOOD PHARMA SUBSIDIARY HOLDINGS, LLC [Member]
FOOD PHARMA SUBSIDIARY HOLDINGS, LLC
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Regulatory maximum borrowing capacity
Debt Instrument, Regulatory Maximum Borrowing Capacity
Debt Instrument, Regulatory Maximum Borrowing Capacity
Qualified dividend income
Investment Income, Dividend
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]
Statement [Table]
Statement [Table]
Asset coverage ratio
Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio, Minimum Threshold
Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio, Minimum Threshold
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Adjustments to reconcile net increase in net assets from operations to net cash (used in) provided by operating activities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Cash flows from financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Receivables:
Nontrade Receivables, Unclassified [Abstract]
ORGANIZATION AND BASIS OF PRESENTATION
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Schedule of Changes in Fair Value of Investments Measured Using Level 3 Inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
All Adjustments to Compensation
All Adjustments to Compensation [Member]
Number of shares repurchased (in shares)
Treasury Stock, Shares, Retired
Amendment Flag
Capital Southwest Corporation And Trinity Capital Inc.
Capital Southwest Corporation And Trinity Capital Inc. [Member]
Capital Southwest Corporation And Trinity Capital Inc.
Available for issuance (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Yield-to-maturity (in percent)
Debt Instrument, Yield-To-Maturity At Issuance
Debt Instrument, Yield-To-Maturity At Issuance
Termination Date
Trading Arrangement Termination Date
DRIVE LINE SERVICE OF PORTLAND, LLC
DRIVE LINE SERVICE OF PORTLAND, LLC [Member]
DRIVE LINE SERVICE OF PORTLAND, LLC
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
Variable rate adjustment
Debt Instrument, Basis Spread on Variable Rate, Adjustment
Debt Instrument, Basis Spread on Variable Rate, Adjustment
Dividend Income
Revenue Recognition, Dividends [Policy Text Block]
Schedule of Investment Portfolio by Level
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Weighted average common shares outstanding – basic (in shares)
Denominator for basic weighted average common share (in shares)
Weighted-average basic common shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Basic
Net asset value
Investment Company, Financial Highlights [Roll Forward]
Securities Litigation Or Shareholder Activism Risk [Member]
Securities Litigation Or Shareholder Activism Risk
2026
Financial Commitment Year One [Member]
Financial Commitment Year One
June 30, 2025 supplemental
S 2025 Q2 Tax Year Dividends [Member]
S 2025 Q2 Tax Year Dividends
Schedule of Basic and Diluted Net Increase in Net Assets Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Investment, Issuer Name [Axis]
Investment, Issuer Name [Axis]
February 2027
Expiration Tranche One [Member]
Expiration Tranche One
Ordinary
Investment Company, Tax Distribution, Ordinary Income
Investment Company, Tax Distribution, Ordinary Income
Subsequent Events [Abstract]
Cash flows from operating activities
Additional Cash Flow Elements, Operating Activity [Abstract]
Lease expense
Operating Lease, Expense
Interest or penalties expense
Income Tax Examination, Penalties and Interest Expense
Specialty Retail
Specialty Retail Sector [Member]
Specialty Retail Sector
Debt Disclosure [Abstract]
Schedule of Restricted Stock Outstanding
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]
Tax Liability Risk [Member]
Tax Liability Risk
Restaurants
Restaurants Sector [Member]
Restaurants Sector
Right to grant period (in years)
Share-Based Compensation Arrangement By Share-Based Payment Award, Plan Expiration Period
Share-Based Compensation Arrangement By Share-Based Payment Award, Plan Expiration Period
Undiscounted excess amount not disclosed
Lessee, Operating Lease, Liability, Undiscounted Excess Amount Not Disclosed
Lessee, Operating Lease, Liability, Undiscounted Excess Amount Not Disclosed
Unamortized debt issuance costs
Unamortized Debt Issuance Costs and Debt Discount/Premium
Debt Instrument, Unamortized Discount
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Common stock, par value (in usd per share)
Common Stock, Par or Stated Value Per Share
Change in restoration plan liability
Change In Restoration Plan Liability
Change In Restoration Plan Liability
2031-2035
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years
MERCURY ACQUISITION 2021, LLC
MERCURY ACQUISITION 2021, LLC [Member]
MERCURY ACQUISITION 2021, LLC
Schedule of Distribution
Investment Company, Distribution To Shareholders [Table Text Block]
Investment Company, Distribution To Shareholders
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Business Services
Business Services Sector [Member]
Business Services Sector
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Axis]
Repayments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements
Dividends to shareholders
Payments of Dividends
Northeast
US Northeast Region [Member]
Target company, annual EBITDA
Investment Company, Target Investment, Annual Earnings Before Interest, Taxes, Depreciation And Amortization
Investment Company, Target Investment, Annual Earnings Before Interest, Taxes, Depreciation And Amortization
SUBSEQUENT EVENTS
Subsequent Events [Text Block]
Decrease (increase) in escrow receivables
Increase (Decrease) in Deposit Assets
Insider Trading Arrangements [Line Items]
Equity Investments
Equity Securities [Member]
CAVALIER BUYER, INC.
CAVALIER BUYER, INC., Equity Investments [Member]
CAVALIER BUYER, INC., Equity Investments
Total liabilities
Liabilities
Commitment fee percentage
Line of Credit Facility, Commitment Fee Percentage
Lease extension
Lessee, Operating Lease, Extension Term
Lessee, Operating Lease, Extension Term
Conversion Dilution Risk [Member]
Conversion Dilution Risk
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
Schedule of Net Pension Costs
Schedule of Costs of Retirement Plans [Table Text Block]
Repurchased face amount
Debt Instrument, Repurchased Face Amount
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Research & Consulting Services
Research & Consulting Services
Research & Consulting Services Sector [Member]
Research & Consulting Services Sector
Telecommunications
Telecommunications Sector [Member]
Telecommunications Sector
Issuance of common stock
Stock Issued During Period, Value, New Issues
October 2024 Notes [Member]
October 2024 Notes
Counterparty Name [Axis]
Counterparty Name [Axis]
Total investment income
Gross Investment Income, Operating
Trading days
Debt Instrument, Convertible, Threshold Trading Days
IGNITE VISIBILITY LLC
IGNITE VISIBILITY LLC [Member]
IGNITE VISIBILITY LLC
Entity Incorporation, State or Country Code
Non-NEOs
Non-NEOs [Member]
Investment Company, Summary Of Dividends And Distributions, Tax Differences [Table]
Investment Company, Summary Of Dividends And Distributions, Tax Differences [Table]
Investment Company, Summary Of Dividends And Distributions, Tax Differences [Table]