Classification of Investments and Investment Valuation Policy Investment, Policy [Policy Text Block] Non-Control/Non-Affiliate investments Non-Control/Non-Affiliate Investments Investment, Unaffiliated Issuer [Member] Realized investment gains Realized investment gains (losses) Realized Investment Gains (Losses) Award Timing Predetermined Award Timing Predetermined [Flag] Syndicated loan fee credit Investment Company, Syndicated Loan Fee Credit Investment Company, Syndicated Loan Fee Credit Securities Act File Number Turn Key Health Clinics, LLC Turn Key Health Clinics, LLC [Member] Turn Key Health Clinics, LLC Tabular List, Table Tabular List [Table Text Block] Net realized and unrealized gain (loss) on investments (in USD per share) Investment Company, Gain (Loss) on Investment, Per Share Beverage, Food, and Tobacco Beverage, Food, and Tobacco [Member] Beverage, Food, and Tobacco Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Preferred 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[Member] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Total net realized gain (loss) Net realized loss (gain) on investments and other Net Realized Gain (Loss) for Period Debt and Equity Securities, Realized Gain (Loss) Cash equivalents, market yield Cash Equivalents, Market Yield Cash Equivalents, Market Yield Distributions to common stockholders from realized gains (in USD per share) Realized gains (in USD per share) Investment Company, Distribution To Shareholders From Realized Gains, Per Share Investment Company, Distribution To Shareholders From Realized Gains, Per Share Preferred equity Preferred equity Preferred Equity [Member] Preferred Equity TOTAL NET ASSETS NET ASSETS, beginning balance NET ASSETS, ending balance Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Insider Trading Policies and Procedures [Line Items] Investment company, capital gains-based incentive fees Investment Company, Capital Gains-based Incentive Fees, Percentage Investment Company, Capital Gains-based Incentive Fees, Percentage Net change in premiums, discounts and amortization Net Change in Premiums, Discounts and Amortization Net Change in Premiums, Discounts and Amortization Common stock, shares authorized (in shares) Common Stock, Shares Authorized Fair Value, Recurring Fair Value, Recurring [Member] Cost percentage Investment Owned, Percent of Cost Basis Investment Owned, Percent of Cost Basis Fees due to related party Accounts Payable, Other Altior Healthcare, LLC Altior Healthcare, LLC [Member] Altior Healthcare, LLC Cash equivalents, fair value Cash Equivalents Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] 2029 Principal Repayment And Maturity Of Investments, Year Four Principal Repayment And Maturity Of Investments, Year Four Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line 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and Non-Durable Consumer Products (Manufacturing Only) Personal and Non-Durable Consumer Products (Manufacturing Only) [Member] Personal and Non-Durable Consumer Products (Manufacturing Only) Statement of Stockholders' Equity [Abstract] Revolving Line of Credit Revolving Line of Credit [Member] Revolving Line of Credit Foodservices Brand Group (“FBG”) Foodservices Brand Group (“FBG”) [Member] Foodservices Brand Group (“FBG”) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Net unrealized (appreciation) depreciation Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Unrealized Appreciation (Depreciation) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Unrealized Appreciation (Depreciation) Base management fee due to (from) Adviser Base Management Fee Due to Adviser [Member] Base Management Fee Due to Adviser Base management fee Management Fee Expense Document Fiscal Period Focus Buildings and Real Estate Buildings and Real Estate [Member] Buildings and Real Estate Preferred stock, shares authorized (in shares) Temporary Equity, Shares Authorized Risks Related To Our Regulation And Structure [Member] Risks Related To Our Regulation And Structure Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in net assets resulting from operations, basic (in USD per share) Basic net increase (decrease) in net assets resulting from operations per common share (in USD per share) Income (Loss) from Continuing Operations, Per Basic Share Common stock, dividends, declared, ordinary (in USD per share) Common Stock, Dividends, Per Share, Declared, Ordinary Common Stock, Dividends, Per Share, Declared, Ordinary Revenue multiple Measurement Input, Revenue Multiple [Member] Total investments and cash equivalents, cost Investments And Cash Equivalents Investments And Cash Equivalents Award Type Award Type [Axis] Perimeter Solutions Group Perimeter Solutions Group [Member] Perimeter Solutions Group Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Allowance for uncollectible receivables Investment Company, Allowance For Uncollectible Receivables Investment Company, Allowance For Uncollectible Receivables Entity Address, City or Town Five Largest Portfolio Investments Five Largest Portfolio Investments [Member] Five Largest Portfolio Investments Investment company, number of obligor Investment Company, Number of Obligors Investment Company, Number of Obligors Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount O 2025 M7 Dividends O 2025 M7 Dividends [Member] O 2025 M7 Dividends Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Other, net (in USD per share) Investment Company, Net Asset Value Per Share, Other Increase (Decrease), Net Investment Company, Net Asset Value Per Share, Other Increase (Decrease), Net 6.25% Series A Cumulative Redeemable Preferred Stock [Member] 6.25% Series A Cumulative Redeemable Preferred Stock Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Incentive fee base on minimum rate of return required on investment Investment Company, Incentive Fee When Pre-Incentive Fee Net Investment Income Does Not Exceed Hurdle Rate Investment Company, Incentive Fee When Pre-Incentive Fee Net Investment Income Does Not Exceed Hurdle Rate Entity Emerging Growth Company Gladstone Alternative Income Fund Gladstone Alternative Income Fund [Member] Gladstone Alternative Income Fund O 2024 M10 Dividends O 2024 M10 Dividends [Member] O 2024 M10 Dividends Repayments on line of credit Repayments of Lines of Credit 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] Deferred financing costs, net Debt Issuance Costs, Net Borrowings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Common stock, shares, outstanding (in shares) Common stock outstanding at end of year (in shares) Common Stock, Shares, Outstanding Distributions to common stockholders from realized gains Investment Company, Distribution, Long-Term Capital Gain Series 2021 Term Preferred Stock [Member] Series 2021 Term Preferred Stock Chief Executive Officer Chief Executive Officer [Member] Covenant, required minimum net worth of mandatory redeemable term preferred stock, plus percent of all equity and subordinated debt raised, minus percent of any equity or subordinated debt redeemed or retired Debt Instrument, Covenant, Net Worth Of Mandatory Redeemable Term Preferred Stock, Plus Percent of All Equity and Subordinated Debt Raised, Minus Any Equity Or Subordinated Debt Redeemed or Retired Debt Instrument, Covenant, Net Worth Of Mandatory Redeemable Term Preferred Stock, Plus Percent of All Equity and Subordinated Debt Raised, Minus Any Equity Or Subordinated Debt Redeemed or Retired Net investment income (in USD per share) Net investment income (in USD per share) Investment Company, Distribution to Shareholders from Net Investment Income, Per Share Investment Company, Distribution to Shareholders from Net Investment Income, Per Share Cargo Transportation Cargo Transportation [Member] Cargo Transportation 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] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Amount of Investment Income Interest and Dividend Income, Securities, Operating Income tax provisions Income Tax Expense (Benefit) Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Secured second lien debt Secured second lien debt Debt Securities, Secured Second Lien Debt [Member] Debt Securities, Secured Second Lien Debt NET INCREASE (DECREASE) IN NET ASSETS Stockholders' Equity, Period Increase (Decrease) Other assets, net Other Assets Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Purchase of investments Purchase of investments Payment for Purchase, Investment, Operating Activity Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Number of proprietary investments Number of Proprietary Investments Number of Proprietary Investments Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] B+T Group Acquisition, Inc., Edge Adhesives Holdings, Inc,. And WB Xcel Holdings, LLC B+T Group Acquisition, Inc., Edge Adhesives Holdings, Inc,. And WB Xcel Holdings, LLC [Member] B+T Group Acquisition, Inc., Edge Adhesives Holdings, Inc,. And WB Xcel Holdings, LLC Cumulative gross unrealized depreciation Investment, Tax Basis, Unrealized Loss Notes Payable Notes Payable, Other Payables [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] O 2025 M5 Dividends O 2025 M5 Dividends [Member] O 2025 M5 Dividends Unused line of credit commitments Unused lines of Credit [Member] 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 Debt Instrument, Redemption Price, Percentage Investment, interest rate, paid in cash Investment, Interest Rate, Paid in Cash Undistributed capital gain Investment Company, Distributable Earnings (Loss), Accumulated Long-Term Capital Gain (Loss) Commitments and Contingencies Disclosure [Abstract] Cash equivalents, net assets, percentage Cash Equivalents, Net Assets, Percentage Cash Equivalents, Net Assets, Percentage Total expenses, net of credits Investment Company, Expense, after Reduction of Fee Waiver and Reimbursement Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Dealer Manager Agreement Dealer Manager Agreement [Member] Dealer Manager Agreement Conversion Premium (in percent) Debt Instrument, Conversion Premium Percentage Debt Instrument, Conversion Premium Percentage Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Net proceeds from sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Subsequent Event Subsequent Event [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total 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Capital Adjustments Affiliate investments Affiliate Investments Investment, Affiliated Issuer, Noncontrolled [Member] Investment Company, Net Assets [Roll Forward] Investment Company, Net Assets [Roll Forward] Individual: Individual [Axis] Senior securities, asset coverage ratio Senior Securities, Asset Coverage Ratio Senior Securities, Asset Coverage Ratio Distributions paid to common stockholders Payments of Ordinary Dividends, Common Stock Document Annual Report Per Common Share Data Investment Company, Per Share Data [Abstract] Investment Company, Per Share Data Number of industries that have made investments Number Of Industries Invested In Number Of Industries Invested In Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Syndicated Investments Syndicated Investments [Member] Syndicated Investments Distributions Investment Company, Distribution [Policy Text Block] Entity Interactive Data Current Accumulated net realized losses Investment Company, Accumulated Net Realized Gain In Excess Of Distribution Investment Company, Accumulated Net Realized Gain In Excess Of Distribution Ratio of net expenses to average net assets Investment Company, Expense Ratio after Incentive Allocation O 2024 M8 Dividends O 2024 M8 Dividends [Member] O 2024 M8 Dividends Investment owned, at cost Cost Investment owned, at cost Investment owned, cost Investment Owned, Cost Number of investment portfolio company Number Of Investment Portfolio Company Number Of Investment Portfolio Company Ownership [Domain] Ownership [Domain] Net realized gain (loss) Debt and Equity Securities, Realized Gain (Loss) [Member] Debt and Equity Securities, Realized Gain (Loss) Wings ‘N More Restaurants, LLC Wings ‘N More Restaurants, LLC [Member] Wings ‘N More Restaurants, LLC General Risk Factors [Member] General Risk Factors 3.75% Notes due 2027 3.75% Notes due 2027 [Member] 3.75% Notes due 2027 Sale of stock, aggregate value of securities authorized Sale of Stock, Aggregate Value of Securities Authorized Sale of Stock, Aggregate Value of Securities Authorized NET ASSET VALUE PER COMMON SHARE (in USD per share) Net asset value at beginning of period / year (in USD per share) Net asset value at end of period / year (in USD per share) Customer [Domain] Customer [Domain] Entity Central Index Key PEO Name PEO Name Conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price 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] Supplemental Cash Flow Elements Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Common stock, dividends, paid, ordinary (in USD per share) Common Stock, Dividends, Per Share, Paid, Ordinary Common Stock, Dividends, Per Share, Paid, Ordinary Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Midwest US Midwest Region [Member] Preferred stock, $0.001 par value per share, 6,000,000 and 6,000,000 shares authorized, respectively, and 865,452 and 349,931 shares issued and outstanding, respectively Temporary Equity, Carrying Amount, Attributable to Parent Exercise Price Award Exercise Price Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] ENET Holdings, LLC ENET Holdings, LLC [Member] ENET Holdings, LLC Subsequent Event Type [Axis] Subsequent Event Type [Axis] 2030 Convertible Notes 2030 Convertible Notes [Member] 2030 Convertible Notes Tax return of capital distribution Investment Company, Tax Return of Capital Distribution Antenna Research Associates, Inc Antenna Research Associates, Inc [Member] Antenna Research Associates, Inc 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] Entity Address, Address Line One O 2024 M1 Dividends O 2024 M1 Dividends [Member] O 2024 M1 Dividends Entity Address, Address Line Two Cumulative net unrealized appreciation Investment, Tax Basis, Unrealized Gain Investments [Domain] Investments [Domain] Base management fee Management and Service Fees, Base Rate Ownership [Axis] Ownership [Axis] Industry Sector [Axis] Industry Sector [Axis] Total investments and cash equivalents, fair value Cash Equivalents and Investments, Fair Value Cash Equivalents and Investments, Fair Value Fair Value as of Grant Date Award Grant Date Fair Value Investments in equity securities Equity Securities, FV-NI, Cost Risks Related To Our 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Gross Reductions Reversal of prior period net depreciation (appreciation) on realization Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Reversal Of Previously Recorded (Appreciation) Depreciation Upon Realization Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Reversal Of Previously Recorded (Appreciation) Depreciation Upon Realization Schedule of Fair Value Measurement Inputs and Valuation Techniques 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] Reverse stock split, conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Other temporary differences Investment Company, Distributable Earnings (Loss), Accumulated Other Temporary Differences Investment Company, Distributable Earnings (Loss), Accumulated Other Temporary Differences Investment Type [Axis] Investment Type [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount O 2024 Q4 Regular Dividends O 2024 A Regular Dividends [Member] O 2024 A Regular Dividends Sicilian Oven Holdings, LLC Sicilian Oven Restaurants, LLC [Member] Sicilian Oven Restaurants, LLC Market Quote Market Quote [Member] Market Quote Non-PEO NEO Non-PEO NEO [Member] Line of credit outstanding, at cost Borrowings outstanding, at cost Letters of Credit Outstanding, Amount Fee income Fee Income Debt instrument, covenant, senior security, indebtedness, required minimum asset coverage ratio Debt Instrument, Covenant, Senior Security, Indebtedness, Required Minimum Asset Coverage Ratio Debt Instrument, Covenant, Senior Security, Indebtedness, Required Minimum Asset Coverage Ratio Risks Related To Our External Financing [Member] Risks Related To Our External Financing Sale of Stock [Axis] Sale of Stock [Axis] All Award Types Award Type [Domain] Covenant, required minimum net worth of mandatory redeemable term preferred stock Debt Instrument, Covenant, Required Minimum Net Worth Of Mandatory Redeemable Term Preferred Stock Debt Instrument, Covenant, Required Minimum Net Worth Of Mandatory Redeemable Term Preferred Stock Investments in and Advances to Affiliates [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Other income Other Income Compensation Amount Outstanding Recovery Compensation Amount Zero Case Holding Inc. Zero Case Holding Inc. [Member] Zero Case Holding Inc. Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Thereafter Principal Repayment And Maturity Of Investments, After Year Five Principal Repayment And Maturity Of Investments, After Year Five Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Net increase (decrease) in net assets from capital transactions Investment Company, Capital Activity, Increase (Decrease) Investment Company, Capital Activity, Increase (Decrease) MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] WEIGHTED AVERAGE SHARES OF COMMON STOCK OUTSTANDING: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Total Access Elevator, LLC (“Total Access”) Total Access Elevator, LLC (“Total Access”) [Member] Total Access Elevator, LLC (“Total Access”) INVESTMENT INCOME Revenues [Abstract] Documents Incorporated by Reference Number of investments Number of Investment Number of Investment Vet’s Choice Radiology, LLC Vet’s Choice Radiology, LLC [Member] Vet’s Choice Radiology, LLC Financial Instruments [Domain] Financial Instruments [Domain] Net Unrealized Appreciation (Depreciation) Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Ratios/Supplemental Data: Investment Company, Financial Ratios [Abstract] Minimum Minimum [Member] Schedule of Dividends Declared Investment Company, Cash Distributions Paid To Common Stockholders [Table Text Block] Investment Company, Cash Distributions Paid To Common Stockholders Company Selected Measure Name Company Selected Measure Name BORROWINGS Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Numerator for diluted net increase (decrease) in net assets resulting from operations per common share Net Income (Loss) Available to Common Stockholders, Diluted Collateral Held [Domain] Collateral Held [Domain] Alsay, Inc. Alsay, Inc. [Member] Alsay, Inc. Preferred stock dividends (in USD per share) Preferred stock, dividends, declared, ordinary (in USD per share) Preferred Stock, Dividends, Per Share, Declared, Ordinary Preferred Stock, Dividends, Per Share, Declared, Ordinary COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Preferred stock, dividend rate, percentage Temporary Equity, Dividend Rate, Percentage Temporary Equity, Dividend Rate, Percentage Diluted (in shares) Denominator for diluted weighted average common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Segment Reporting Segment Reporting, Policy [Policy Text Block] Diversified/Conglomerate Manufacturing Diversified/Conglomerate Manufacturing [Member] Diversified/Conglomerate Manufacturing Financial Support to Nonconsolidated Legal Entity [Axis] Financial Support to Nonconsolidated Legal Entity [Axis] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Indebtedness asset coverage on our senior 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Notes Payable Principal repayments on investments Proceeds from Principal Repayments Of Investments, Operating Activity Proceeds from Principal Repayments Of Investments, Operating Activity PIK Payment in Kind (PIK) Note [Member] Cumulative gross unrealized appreciation (depreciation) for federal income tax purposes Investment, Tax Basis, Unrealized Gain (Loss) Other Other Sectors [Member] Other Sectors Revenue Measurement Input, Revenue [Member] Measurement Input, Revenue Statistical Measurement [Axis] Statistical Measurement [Axis] SOFR, Tranche One Secured Overnight Financing Rate (SOFR), Tranche One [Member] Secured Overnight Financing Rate (SOFR), Tranche One Unused fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Management and service fees, loans Management and Service Fees, Loans Management and Service Fees, Loans Portfolio company fee credit Investment Company , Portfolio Company Fee Credit Investment Company , Portfolio Company Fee Credit 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Remaining Capacity of Offering Price Authorized Yield Analysis Yield Analysis [Member] Yield Analysis Discounts, commissions, and offering costs (in USD per share) Investment Company, Discounts, Commissions, And Offering Costs, Per Share Investment Company, Discounts, Commissions, And Offering Costs, Per Share Shares Investment Owned, Balance, Shares Dividends [Domain] Dividends [Domain] Expiration Date Trading Arrangement Expiration Date Line of credit facility, accordion feature maximum borrowing capacity Line Of Credit Facility, Accordion Feature, Maximum Borrowing Capacity Line Of Credit Facility, Accordion Feature, Maximum Borrowing Capacity Investment company, other operating expenses, due to advisor Investment Company, Other Operating Expenses, Due to Advisor Investment Company, Other Operating Expenses, Due to Advisor Net investment income, basic (in USD per share) Net investment income (in USD per share) Investment Company, Investment Income (Loss), Per Share, Basic Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities NET REALIZED AND UNREALIZED GAIN (LOSS) Net Realized Gains (Losses) [Abstract] Net Realized Gains (Losses) Schedule of Principal Balances of Unused Line of Credit and Delayed Draw Term Debt Commitments and Guaranties Schedule For Financial Support For Nonconsolidated Entity [Table Text Block] Schedule For Financial Support For Nonconsolidated Entity PIK interest income Interest Income, Operating, Paid in Kind Net Base Management Fee Net Base Management Fee Net Base Management Fee Total Investments [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Automobile Automobile [Member] Automobile Series A Preferred Stock Series A Preferred Stock [Member] Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Proceeds from convertible debt Proceeds from Convertible Debt Collateral Held [Axis] Collateral Held [Axis] Viva Railings, LLC Viva Railings, LLC [Member] Viva Railings, LLC Financial Instrument [Axis] Financial Instrument [Axis] INVESTMENTS IN AND ADVANCES TO AFFILIATES Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Schedule of Adjustments for permanent book-tax differences to reflect character Investment Company, Components Of Distributable Earnings (Accumulated Losses) [Table Text Block] Investment Company, Components Of Distributable Earnings (Accumulated Losses) Proceeds from issuance of notes payable Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Loan servicing fee Loan Processing Fee 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] Proceeds from issuance of preferred stock Proceeds from Issuance of Preferred Stock and Preference Stock Collateral Pledged Collateral Pledged [Member] Investment Type Concentration Risk Investment Type Concentration Risk [Member] Investment Type Concentration Risk Other Commitments [Table] Other Commitments [Table] Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Oil and Gas Oil and Gas Industry [Member] Oil and Gas Industry Measure: Measure [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Capital gains-based incentive fee Capital Gains-Based Incentive Fee Capital Gains-Based Incentive Fee Gladstone Investment Corporation Gladstone Investment Corporation [Member] Gladstone Investment Corporation Investment and cash equivalents, net assets, percentage Investment And Cash Equivalents, Net Assets, Percentage Investment And Cash Equivalents, Net Assets, Percentage Viron International, LLC Viron International, LLC [Member] Viron International, LLC Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Incentive fee due to (from) Adviser Incentive Fee Due to Adviser [Member] Incentive Fee Due to Adviser Expenses, before credits from Adviser Investment Income, Investment Expense Entity Tax Identification Number Fair value percentage Investment Owned, Percent of Fair Value Investment Owned, Percent of Fair Value Preferred and common equity / equivalents Preferred and Common Equity / Equivalents [Member] Preferred and Common Equity / Equivalents Common stock, shares, issued (In shares) Common Stock, Shares, Issued 5.375% Notes due 2024 [Member] 5.375% Notes due 2024 Machinery Machinery [Member] Machinery Entity Public Float Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Cumulative net unrealized appreciation (depreciation) of investments Cumulative net unrealized appreciation (depreciation) of investments Investment Company, Distributable Earnings (Loss), Accumulated Appreciation (Depreciation) Security Exchange Name O 2025 M9 Dividends O 2025 M9 Dividends [Member] O 2025 M9 Dividends 8th Avenue Food and Provisions, Inc. 8th Avenue Food and Provisions, Inc. [Member] 8th Avenue Food and Provisions, Inc. Line of credit facility, maximum borrowing capacity Commitment amount Line of Credit Facility, Maximum Borrowing Capacity PREFERRED STOCK DIVIDENDS Preferred stock dividends Preferred stock dividends Dividends, Preferred Stock Per common share market value at beginning of year (in USD per share) Per common share market value at end of year (in USD per share) Investment Company, Market Value, Per Share EXPENSES Operating Expenses [Abstract] Asset Class [Domain] Asset Class [Domain] Weighted average interest rate Line of Credit Facility, Interest Rate During Period Total gain (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Ohio Armor Holdings, LLC Ohio Armor Holdings, LLC [Member] Ohio Armor Holdings, LLC NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, RESTRICTED CASH, AND RESTRICTED CASH EQUIVALENTS Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Common stock dividends paid (in USD per share) Common Stock, Dividends, Per Share, Cash Paid SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] O 2025 M8 Dividends O 2025 M8 Dividends [Member] O 2025 M8 Dividends Related Party Transaction [Axis] Related Party Transaction [Axis] Investment company, prepayment fee Investment Company, Prepayment Fee Income Investment Company, Prepayment Fee Income Asset Class [Axis] Asset Class [Axis] Dividend income Dividend Income, Operating, Paid in Cash Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Financing costs Payments of Financing Costs Leadpoint Business Services, LLC Leadpoint Business Services, LLC [Member] Leadpoint Business Services, LLC 5.125% Notes due 2026 5.125% Notes due 2026 [Member] 5.125% Notes due 2026 Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] Increase (decrease) in accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Common stock, dividends, paid, supplemental (in USD per share) Common Stock, Dividends, Per Share, Paid, Supplemental Common Stock, Dividends, Per Share, Paid, Supplemental Discount Rate Measurement Input, Discount Rate [Member] Threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Decrease (increase) in interest receivable, net Increase (Decrease) in Accrued Interest Receivable, Net Under distributed net investment income Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss) EBITDA multiple Measurement Input, EBITDA Multiple [Member] Measurement Input Type [Domain] Measurement Input Type [Domain] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Other general and administrative expenses Other General and Administrative Expense Cash and cash equivalents Cash and Cash Equivalents [Member] Average net assets Investment Company, Average Net Assets Distributions to common stockholders from net investment income Investment Company, Distribution, Ordinary Income Total from operations (in USD per share) Investment Company, Investment Income (Loss) from Operations, Per Share Notes payable, fair value disclosure Notes Payable, Fair Value Disclosure Risks Related To Our External Management [Member] Risks Related To Our External Management Uncalled capital commitment Financial Support, Capital Contributions [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Investment company, net investment income to common stockholder distributions ratio, threshold Investment Company, Net Investment Income To Common Stockholder Distributions Ratio, Threshold Investment Company, Net Investment Income To Common Stockholder Distributions Ratio, Threshold Threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Sea Link International IRB, Inc Sea Link International IRB, Inc [Member] Sea Link International IRB, Inc Accounting Policies [Abstract] Dealer manager fees percentage Dealer Manager Fee Percentage Dealer Manager Fee Percentage Concentration Risk Type [Domain] Concentration Risk Type [Domain] Credits to base management fee – loan servicing fee Investment Company, Contractual Fee Waived Percentage of pre-incentive fee net investment income is less than the hurdle rate Investment Company, Percentage Of Pre-incentive Fee Net Investment Income Exceeds The Hurdle Rate Investment Company, Percentage Of Pre-incentive Fee Net Investment Income Exceeds The Hurdle Rate Pay vs Performance Disclosure [Line Items] Net realized gain (loss) on investments Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax LIABILITIES Liabilities [Abstract] Investment Holdings [Table] Investment Holdings [Table] Interest payable Debt Instrument, Periodic Payment, Interest Stock redeemed (in shares) Stock Redeemed or Called During Period, Shares Percentage of principal amount redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 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] OID Originally Issued at Discounts [Member] Originally Issued at Discounts Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Cash Cash Measurement Input Type [Axis] Measurement Input Type [Axis] Investment, Issuer Affiliation [Axis] Investment, Issuer Affiliation [Axis] Name Measure Name Issuances/originations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Class of Stock [Line Items] Class of Stock [Line Items] Industry Sector [Domain] Industry Sector [Domain] Unsecured debt Unsecured Debt [Member] Other Other Investment Companies [Member] O 2024 M2 Dividends O 2024 M2 Dividends [Member] O 2024 M2 Dividends Debt investments with maturity dates prior to period end Debt Investments With Maturity Dates Prior To Period End, Amount Debt Investments With Maturity Dates Prior To Period End, Amount TOTAL ASSETS Assets Aerospace and Defense Aerospace and Defense [Member] Aerospace and Defense Restricted Cash and Cash Equivalents Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Geographical [Domain] Geographical [Domain] Gladstone Securities Gladstone Securities [Member] Gladstone Securities TEV Total Enterprise Value [Member] Total Enterprise Value Income Taxes Income Tax, Policy [Policy Text Block] CASH FLOWS FROM OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Common equity/equivalents Common equity/equivalents Common Equity/ Equivalents Common Equity/Equivalents [Member] Common Equity/Equivalents FES Resources Holdings, LLC FES Resources Holdings, LLC [Member] FES Resources Holdings, LLC Interest expense on line of credit and notes payable Interest Expense, Borrowings MCG Energy Solutions, LLC MCG Energy Solutions, LLC [Member] MCG Energy Solutions, LLC Investments in and Advances to Affiliates, Activity [Line Items] Investments in and Advances to Affiliates, Activity [Line Items] MASSiv Brands, LLC MASSiv Brands, LLC [Member] MASSiv Brands, LLC Dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Principal amount Investment Owned, Balance, Principal Amount Number of states which have invested in the company location Number Of States Where Portfolio Company Investments Are Located Number Of States Where Portfolio Company Investments Are Located Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Investment, Unaffiliated and Affiliated Issuer, Excluding Other Investment, Unaffiliated and Affiliated Issuer, Excluding Other [Member] Investment, Unaffiliated and Affiliated Issuer, Excluding Other Document Financial Statement Error Correction [Flag] Preferred stock, par or stated value per share (in USD per share) Temporary Equity, Par or Stated Value Per Share Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Adjustments to cost basis of debt investments Principal Repayment And Maturity Of Investments, Adjustments to Cost Basis of Debt Investments Principal Repayment And Maturity Of Investments, Adjustments to Cost Basis of Debt Investments Related Party Related Party [Member] PEO PEO [Member] Personal and Non-Durable Consumer Products Personal and Non-Durable Consumer Products [Member] Personal and Non-Durable Consumer Products Investment owned, measurement input Investment Company, Investment Owned, Measurement Input Investment Company, Investment Owned, Measurement Input Schedule of Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Gross receivables from portfolio companies Investment Company, Gross Receivables From Portfolio Companies Investment Company, Gross Receivables From Portfolio Companies Finance Finance [Member] Finance 6.125% Notes due 2023 [Member] 6.125% Notes due 2023 CASH, CASH EQUIVALENTS, RESTRICTED CASH, AND RESTRICTED CASH EQUIVALENTS, BEGINNING OF YEAR CASH, CASH EQUIVALENTS, RESTRICTED CASH, AND RESTRICTED CASH EQUIVALENTS, END OF YEAR Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Credits to fees from Adviser - other Credits to fees from Adviser - other Investment Company, Voluntary Fee Waived Sale of Stock [Domain] Sale of Stock [Domain] Investments at fair value Investments, Fair Value Disclosure Increase (decrease) in interest payable Increase (Decrease) in Interest Payable, Net Customer Concentration Risk Customer Concentration Risk [Member] Proceeds from interest received Proceeds from Interest Received Secured first lien debt Secured first lien debt Secured First Lien Debt Debt Securities, Secured First Lien Debt [Member] Debt Securities, Secured First Lien Debt Net increase (decrease) in net assets resulting from operations, diluted (in USD per share) Diluted net increase (decrease) in net assets resulting from operations per common share (in USD per share) Income (Loss) from Continuing Operations, Per Diluted Share NET INVESTMENT INCOME Net Investment Income Net increase (decrease) in net assets from operations Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Net decrease in net assets from distributions Investment Company, Dividend Distribution Title of 12(g) Security City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] INVESTMENTS Investment [Text Block] RF Technologies, LLC RF Technologies, LLC [Member] RF Technologies, LLC Total contractual repayments Principal Repayment And Maturity Of Investments Principal Repayment And Maturity Of Investments, Deferred Financing and Offering Costs Financing Receivable, Fee and Interest Income [Policy Text Block] Base management fee, percent fee Management And Service Fees, Percent Of Fee Credits Against Base Management Fee Management And Service Fees, Percent Of Fee Credits Against Base Management Fee Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Interest receivable, net Interest Receivable Incentive fee credit Investment Company , Incentive Fee Credit Investment Company , Incentive Fee Credit Related Party Transactions [Abstract] Incentive fee Incentive Fee Expense Other liabilities Other Liabilities O 2024 M9 Dividends O 2024 M9 Dividends [Member] O 2024 M9 Dividends Healthcare, Education, and Childcare Healthcare, Education, and Childcare [Member] Healthcare, Education, and Childcare Auditor Name Schedule of Investment Company, Financial Highlights Investment Company, Financial Highlights [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Based on a tax cost Investment, Tax Basis, Cost NON-CASH ACTIVITIES Investment Company, Non-Cash Activities Investment Company, Non-cash Activities Related Party [Domain] Related and Nonrelated Parties [Domain] Restricted cash Restricted Cash 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 DURING YEAR FOR INTEREST Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Series 2024 Term Preferred Stock [Member] Series 2024 Term Preferred Stock Capital loss carryforward Investment Company, Distributable Earnings (Loss), Accumulated Capital Loss Carryforward Equity [Abstract] West US West Region [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Other Commitments [Line Items] Other Commitments [Line Items] Investment Portfolio Benchmark Investment Portfolio Benchmark [Member] Investment Portfolio Benchmark New investments, repayments and settlements: Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Weighted Average Weighted Average [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] OCI, LLC OCI, LLC [Member] OCI, LLC Total gross cost Stock Redeemed or Called During Period, Value Investment Owned, At Cost Investment Owned, At Cost [Member] Investment Owned, At Cost Snif-Snax, LLC Snif-Snax, LLC [Member] Snif-Snax, LLC Prepayment fee income Prepayment Fees on Advances, Net Sokol Sokol [Member] Sokol Conversion rate Debt Instrument, Convertible, Conversion Ratio Sale of stock, consideration received on transaction Sale of Stock, Consideration Received on Transaction Adjustment for dilutive effect of 2030 Convertible Notes (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities O 2025 M6 Dividends O 2025 M6 Dividends [Member] O 2025 M6 Dividends Schedule of Components of Net Assets Schedule of Stockholders Equity [Table Text Block] Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Selling commissions, percentage Selling Commissions, Percentage Selling Commissions, Percentage Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Closing stock price at issuance (in dollars per share) ASSETS Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Gross Additions Investments in and Advances to Affiliates, at Fair Value, Gross Additions Targus Cayman HoldCo Ltd. Targus Cayman HoldCo Ltd. [Member] Targus Cayman HoldCo Ltd. Underlying Security Market Price Change Underlying Security Market Price Change, Percent Distributions to common stockholders from Effect Of Equity Capital Activity [Abstract] Effect Of Equity Capital Activity Debt Instrument [Axis] Pan-Am Dental, LLC Pan-Am Dental, LLC [Member] Pan-Am Dental, LLC Sokol & Company Holdings, LLC Sokol & Company Holdings, LLC [Member] Sokol & Company Holdings, LLC Credit Facility [Domain] Credit Facility [Domain] DKI Ventures, LLC DKI Ventures, LLC [Member] DKI Ventures, LLC Salt and Straw, LLC Salt and Straw, LLC [Member] Salt and Straw, LLC Total net unrealized appreciation (depreciation) Net unrealized depreciation (appreciation) of investments Debt and Equity Securities, Unrealized Gain (Loss) NET ASSETS Equity, Attributable to Parent [Abstract] Sale of stock, remaining capacity of aggregate value of securities authorized Sale of Stock, Remaining Capacity of Aggregate Value of Securities Authorized Sale of Stock, Remaining Capacity of Aggregate Value of Securities Authorized Investment owned, percent of net assets Investment Owned, Net Assets, Percentage 2028 Principal Repayment And Maturity Of Investments, Year Three Principal Repayment And Maturity Of Investments, Year Three Net Loan Servicing Fee Net Loan Servicing Fee Net Loan Servicing Fee Interest rate Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Industry Concentration Risk Industry Concentration Risk [Member] Industry Concentration Risk Entity Voluntary Filers Increase in investments due to paid-in-kind interest or other Increase in Investments Due to PIK Interest Or Other Increase in Investments Due to PIK Interest Or Other Risks Related To The Economy [Member] Risks Related To The Economy Investment Company [Abstract] FINANCIAL HIGHLIGHTS Investment Company, Financial Highlights [Text Block] Entity Registrant Name Preferred stock, shares, outstanding (in shares) Temporary Equity, Shares Outstanding Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Offering costs for issuance of common stock Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs CAPITAL TRANSACTIONS Investment Company, Capital Share Transaction, Increase (Decrease) [Abstract] Sale of stock, aggregate offering price authorized Sale of Stock, Aggregate Offering Price Authorized Sale of Stock, Aggregate Offering Price Authorized OPERATIONS Net Income (Loss), Including Portion Attributable to Noncontrolling Interest [Abstract] Related Party [Axis] Related and Nonrelated Parties [Axis] DISTRIBUTIONS Investment Company, Distribution to Shareholders [Abstract] Restatement Determination Date: Restatement Determination Date [Axis] Investment owned, number of investments Investment Owned, Number Of Investments Investment Owned, Number Of Investments Net realized and unrealized gain (loss) Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax Investment company, pre-incentive fee net investment income, percent threshold of net assets Investment Company, Pre-Incentive Fee Net Investment Income, Percent Threshold of Net Assets Investment Company, Pre-Incentive Fee Net Investment Income, Percent Threshold of Net Assets Name Trading Arrangement, Individual Name Total Committed capital, unfunded Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount Aggregate principal amount Debt Instrument, Face Amount Accumulated net realized losses Investment Company, Accumulated Net Realized Gain (Loss) In Excess Of Distributions Adjustments Investment Company, Accumulated Net Realized Gain (Loss) In Excess Of Distributions Adjustments Investment, Issuer Affiliation [Domain] Investment, Issuer Affiliation [Domain] Name Awards Close in Time to MNPI Disclosures, Individual Name Escrow holdbacks Escrow Deposit B. Riley Financial, Inc. – Term Debt B. Riley Financial, Inc. – Term Debt [Member] B. Riley Financial, Inc. – Term Debt Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] ICFR Auditor Attestation Flag Cash equivalents Cash Equivalents, at Carrying Value Investment company, cash distributions paid to common stockholders from capital gains Investment Company, Cash Distributions Paid To Common Stockholders From Capital Gains, Percent Investment Company, Cash Distributions Paid To Common Stockholders From Capital Gains, Percent Covenant, required minimum net worth of mandatory redeemable term preferred stock, minus percent of any equity or subordinated debt redeemed or retired Debt Instrument, Covenant, Required Minimum Net Worth Of Mandatory Redeemable Term Preferred Stock, Minus Percent of Any Equity Or Subordinated Debt Redeemed Or Retired Debt Instrument, Covenant, Required Minimum Net Worth Of Mandatory Redeemable Term Preferred Stock, Minus Percent of Any Equity Or Subordinated Debt Redeemed Or Retired Uncollectible receivables allowance, minimum required day for uncollectible adjustment Uncollectible Receivables Allowance, Minimum Required Day For Uncollectible Adjustment Uncollectible Receivables Allowance, Minimum Required Day For Uncollectible Adjustment  Investment Owned, At Fair Value Investment Owned, At Fair Value [Member] Investment Owned, At Fair Value Liability Class [Axis] Liability Class [Axis] Auditor Firm ID Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Line of credit facility, available Availability Line of Credit Facility, Remaining Borrowing Capacity Tube Bending Technology, LLC Tube Bending Technology, LLC [Member] Tube Bending Technology, LLC Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities: Adjustments To Reconcile Net Assets From Operations To Cash Provided by (Used in) Operating Activities [Abstract] Adjustments To Reconcile Net Assets From Operations To Cash Provided by (Used in) Operating Activities Net unrealized appreciation (depreciation) of investments Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Government Assistance [Line Items] Government Assistance [Line Items] Amortization of deferred financing costs Amortization of deferred financing costs Amortization of Debt Issuance Costs and Discounts O 2025 M1 Dividends O 2024 M1 Dividends O 2025 M1 Dividends [Member] O 2025 M1 Dividends Proceeds from sale of investments Proceeds From Sale and Recapitalization of Investments, Net, Operating Activity Proceeds From Sale and Recapitalization of Investments, Net, Operating Activity O 2024 M7 Dividends O 2024 M7 Dividends [Member] O 2024 M7 Dividends Revenue Recognition Revenue [Policy Text Block] Ratio of expenses to average net assets - annualized Investment Company, Expense Ratio before Incentive Allocation Investments in and Advances to Affiliates [Table] Investments in and Advances to Affiliates [Table] Interest payable Interest Payable Net proceeds from the sale of investments Proceeds from Disposition of Investment, Operating Activity All Executive Categories All Executive Categories [Member] Common stock, $0.001 par value per share, 44,000,000 and 44,000,000 shares authorized, respectively, and 22,593,069 and 22,230,587 shares issued and outstanding, respectively Common stock Common Stock, Value, Issued Schedule of Convertible Debt Convertible Debt [Table Text Block] O 2025 M3 Dividends O 2024 M3 Dividends O 2025 M3 Dividends [Member] O 2025 M3 Dividends Covenant, required minimum net worth of mandatory redeemable term preferred stock, plus percent of all equity and subordinated debt raised Debt Instrument, Covenant, Required Minimum Net Worth Of Mandatory Redeemable Term Preferred Stock, Plus Percent of All Equity and Subordinated Debt Raised Debt Instrument, Covenant, Required Minimum Net Worth Of Mandatory Redeemable Term Preferred Stock, Plus Percent of All Equity and Subordinated Debt Raised Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Title and Position [Axis] Title and Position [Axis] Commitments and contingencies Commitments and Contingencies Changes in assets and liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Investments measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Diversified/Conglomerate Service Diversified/Conglomerate Service [Member] Diversified/Conglomerate Service Investment company, target percentage of taxable income to distribute to shareholders (up to) Investment Company, Target Percentage Of Taxable Income To Distribute To Shareholders Investment Company, Target Percentage Of Taxable Income To Distribute To Shareholders O 2025 M12 Dividends O 2025 M12 Dividends [Member] O 2025 M12 Dividends 2027 Principal Repayment And Maturity Of Investments, Year Two Principal Repayment And Maturity Of Investments, Year Two 7.75% Notes due 2028 7.75% Notes due 2028 [Member] 7.75% Notes due 2028 Debt instrument, leverage maturity, terms Debt Instrument, Leverage Maturity, Term Debt Instrument, Leverage Maturity, Term PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Telecommunications Telecommunications [Member] Telecommunications Decrease (increase) in funds due from administrative agent Increase (Decrease) in Due From Administrative Agent Increase (Decrease) in Due From Administrative Agent Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Gladstone Securities, LLC Gladstone Securities, LLC [Member] Gladstone Securities, LLC Transfers Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Remaining authorized share issuance (in shares) Sale of Stock, Remaining Authorized Shares Sale of Stock, Remaining Authorized Shares Name Forgone Recovery, Individual Name Total distributions (in USD per share) Investment Company, Distribution to Shareholders, Per Share 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] O 2025 M4 Dividends O 2025 M4 Dividends [Member] O 2025 M4 Dividends UNCONSOLIDATED SIGNIFICANT SUBSIDIARIES Unconsolidated Significant Subsidiaries [Text Block] Unconsolidated Significant Subsidiaries O 2024 M6 Dividends O 2024 M6 Dividends [Member] O 2024 M6 Dividends Personal, Food, and Miscellaneous Services Personal, Food, and Miscellaneous Services [Member] Personal, Food, and Miscellaneous Services Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Geographical [Axis] Geographical [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Audit Information [Abstract] Audit Information [Abstract] Audit Information Percentage of acquired non-qualifying assets of total assets Percentage of Acquired Non-qualifying Assets of Total Assets Percentage of Acquired Non-qualifying Assets of Total Assets Freedom Dental Management, Inc. Freedom Dental Management, Inc. [Member] Freedom Dental Management, Inc. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Total interest income Interest Income, Operating Title of 12(b) Security Total capital share transactions (in USD per share) Investment Company, Capital Share Transactions, Per Share Investment Company, Capital Share Transactions, Per Share Investment company exit fee Investment Company, Exit Fee Income Investment Company, Exit Fee Income Net investment income Investment Income, Operating, after Expense and Tax BASIC AND DILUTED PER COMMON SHARE: Earnings Per Share [Abstract] Number of loans Number of Loan Receivable Number of Loan Receivable Noncontrolling interest, ownership percentage by parent Subsidiary, Ownership Percentage, Parent Average total assets subject to base management fee Assets under Management, Average Balance Expected Payoff Amount Measurement Input, Expected Payoff Amount [Member] Measurement Input, Expected Payoff Amount SOFR, Thereafter Secured Overnight Financing Rate (SOFR), Thereafter [Member] Secured Overnight Financing Rate (SOFR), Thereafter Ratio of net investment income (loss) to average net assets – annualized Investment Company, Investment Income (Loss) Ratio, before Incentive Allocation O 2024 M11 Dividends O 2024 M11 Dividends [Member] O 2024 M11 Dividends Administration fee Administrative Fees Expense Multiplied by annual base management fee of 1.75% Management and Service Fees, Rate Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Senior security, indebtedness, asset coverage amount Investment Company, Senior Security, Indebtedness, Asset Coverage Amount Investment Company, Senior Security, Indebtedness, Asset Coverage Amount Award Timing Disclosures [Line Items] Fix-It Group, LLC Fix-It Group, LLC [Member] Fix-It Group, LLC Excise tax Investment Company, Excise Tax Expense Measurement Frequency [Domain] Measurement Frequency [Domain] O 2025 A Regular Dividends O 2025 A Regular Dividends [Member] O 2025 A Regular Dividends CUMULATIVE REDEEMABLE PREFERRED STOCK OFFERING DISTRIBUTIONS TO COMMON STOCKHOLDERS Equity [Text Block] O 2025 M11 Dividends O 2025 M11 Dividends [Member] O 2025 M11 Dividends O 2024 M3 Dividends O 2024 M3 Dividends [Member] O 2024 M3 Dividends NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS Net increase (decrease) in net assets resulting from operations Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] O 2025 M10 Dividends O 2025 M10 Dividends [Member] O 2025 M10 Dividends Adoption Date Trading Arrangement Adoption Date Retroactive Adjustments for Reverse Stock Split and Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Customer [Axis] Customer [Axis] Cash equivalents, principal Cash Equivalents, Principal Cash Equivalents, Principal Line of Credit Line of Credit [Member] EBITDA Measurement Input, EBITDA [Member] Measurement Input, EBITDA Net realized gain (loss) on other Realized Gain (Loss), Other, Operating, Before Tax Realized Gain (Loss), Other, Operating, Before Tax Total distributable loss Retained Earnings (Accumulated Deficit) 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] Leeds Acquisition Holdings, LLC Leeds Acquisition Holdings, LLC [Member] Leeds Acquisition Holdings, LLC Class of Stock [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Increase (decrease) in fee due to related party Increase (Decrease) in Due to Related Parties Units Investment Owned, Percentage Investment Owned, Percentage 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] Incentive fee credit Investment Company, Incentive Fee Waived Statement [Table] Statement [Table] Dutch Gold Honey, Inc. Dutch Gold Honey, Inc. [Member] Dutch Gold Honey, Inc. CASH FLOWS FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Eegee Acquisition Corporation Eegee Acquisition Corporation [Member] Eegee Acquisition Corporation Variable Rate [Domain] Variable Rate [Domain] ORGANIZATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Sale of stock, price (in USD per share) Sale of Stock, Price Per Share Repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales O 2024 M5 Dividends O 2024 M5 Dividends [Member] O 2024 M5 Dividends Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] TOTAL NET ASSETS Net assets at end of year Net Assets Schedule of Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Basic (in shares) Denominator for basic weighted average common shares (in shares) Weighted Average Number of Shares Outstanding, Basic Investment Company, Financial Highlights [Roll Forward] Investment Company, Financial Highlights [Roll Forward] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Payments for selling commissions and dealer-manager fees Payments For Selling Commissions And Dealer-Manager Fees Payments For Selling Commissions And Dealer-Manager Fees Related Party Transaction [Domain] Related Party Transaction [Domain] Subsequent Events [Abstract] Debt Disclosure [Abstract] Undistributed net investment income Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss) Adjustments Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss) Adjustments Senior Securities Data: Senior Securities Data [Abstract] Senior Securities Data Pre-incentive fee net investment income exceeds the hurdle rate Investment Company, Percent of Pre-Incentive Fee Net Investment Income That Exceeds Net Assets Threshold Investment Company, Percent of Pre-Incentive Fee Net Investment Income That Exceeds Net Assets Threshold Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par value (in USD per share) Common Stock, Par or Stated Value Per Share Fee due to Administrator Administrator Fee due to Administrator The Administrator [Member] The Administrator Loan servicing fee due to Adviser Loan Servicing Fee Due to Adviser [Member] Loan Servicing Fee Due to Adviser O 2024 M4 Dividends O 2024 M4 Dividends [Member] O 2024 M4 Dividends Investment company, cash distributions paid to common stockholders from ordinary income Investment Company, Cash Distributions Paid To Common Stockholders From Ordinary Income, Percent Investment Company, Cash Distributions Paid To Common Stockholders From Ordinary Income, Percent Use of Estimates Use of Estimates, Policy [Policy Text Block] O 2024 M12 Dividends O 2024 M12 Dividends [Member] O 2024 M12 Dividends Settlements/repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fees due to Adviser Adviser Total fees due to (from) Adviser The Adviser [Member] The Adviser Northeast US Northeast Region [Member] SUBSEQUENT EVENTS Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Common Stock At-the-Market Offerings Common Stock At-the-Market Offerings [Member] Common Stock Under Jefferies Sales Agreement Risks Related To Interest Rates [Member] Risks Related To Interest Rates Net Incentive Fee Net Total Incentive Fee Net Total Incentive Fee Earnings before interest, taxes, depreciation and amortization Investment Company, Earnings Before Interest, Taxes, Depreciation And Amortization Investment Company, Earnings Before Interest, Taxes, Depreciation And Amortization Equity Securities Equity Securities [Member] Cafe Zupas Cafe Zupas [Member] Cafe Zupas SpaceCo Holdings, LLC SpaceCo Holdings, LLC [Member] SpaceCo Holdings, LLC 2030 Principal Repayment And Maturity Of Investments, Year Five Principal Repayment And Maturity Of Investments, Year Five TOTAL LIABILITIES Liabilities Home and Office Furnishings, Housewares and Durable Consumer Products Home and Office Furnishings, Housewares and Durable Consumer Products [Member] Home and Office Furnishings, Housewares and Durable Consumer Products Return of capital (in USD per share) Investment Company, Distribution To Shareholders From Return Of Capital, Per Share Investment Company, Distribution To Shareholders From Return Of Capital, Per Share Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Percentage threshold of qualified assets representing total assets in order to acquire non-qualified assets Percentage Threshold of Qualified Assets Representing Total Assets In Order To Acquire Non-Qualified Assets Percentage Threshold of Qualified Assets Representing Total Assets In Order To Acquire Non-Qualified Assets Issuance of common stock Stock Issued During Period, Value, New Issues Variable Rate [Axis] Variable Rate [Axis] Geographic Regions Risk Geographic Regions Concentration Risk [Member] Geographic Regions Concentration Risk Counterparty Name [Axis] Counterparty Name [Axis] Total investment income Gross Investment Income, Operating Due from administrative agent Due From Administrative Agent Due From Administrative Agent Threshold trading days Debt Instrument, Convertible, Threshold Trading Days Entity Incorporation, State or Country Code Printing and Publishing Printing and Publishing [Member] Printing and Publishing Non-NEOs Non-NEOs [Member] O 2025 M2 Dividends O 2024 M2 Dividends O 2025 M2 Dividends [Member] O 2025 M2 Dividends