Net change in unrealized appreciation (depreciation) on investments and foreign currencies Unrealized Gain (Loss) on Investments Statistical Measurement [Domain] Statistical Measurement [Domain] Investment Transactions Investment, Policy [Policy Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Asset Class [Axis] Asset Class [Axis] Entity File Number Commitment Fee Rate, Utilization 2 Interest Rate Utilization Level 2 [Member] Interest Rate Utilization Level 2 Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Deferred financing costs paid Payments of Financing Costs Net change in unrealized appreciation (depreciation) of investments held Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Net realized gain (loss) Debt and Equity Securities, Realized Gain (Loss) [Member] Debt and Equity Securities, Realized Gain (Loss) Tabular List, Table Tabular List [Table Text Block] Net realized and unrealized gains (losses) (in dollars per share) Investment Company, Gain (Loss) on Investment, Per Share Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Agreements and Related Party Transactions Related Party Transactions Disclosure [Text Block] Schedule of Outstanding Financing Arrangements and Interest Expense Schedule of Line of Credit Facilities [Table Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Interactive Media & Services Interactive Media & Services [Member] Interactive Media & Services Discount Margin Measurement Input, Discount Rate [Member] (Increase) decrease in interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Leisure Facilities Leisure Facilities [Member] Leisure Facilities EBITDA Multiple Measurement Input, EBITDA Multiple [Member] Measurement Input Type [Domain] Measurement Input Type [Domain] Net realized gains (losses) on investments and foreign currencies Net realized gains (losses) on investments and foreign currencies Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax Adjustment to Compensation, Amount Adjustment to Compensation Amount Percentage of Portfolio Concentration Risk, Percentage Basis of Consolidation Consolidation, Policy [Policy Text Block] Net assets: Investment Company, Net Assets [Abstract] Investment Company, Net Assets Health Care Facilities Health Care Facilities [Member] Health Care Facilities Government Sector Government Sector [Member] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Other expenses Other General and Administrative Expense Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Net realized gains (losses) on investments and foreign currencies Debt and Equity Securities, Realized Gain (Loss) Net Assets Beginning of period End of period Net asset value, end of period Equity, Attributable to Parent Investments, Not Including Money Market Funds Investments, Not Including Money Market Funds [Member] Subordinated Debt Insider Trading Policies and Procedures [Line Items] Total investment from operations (in dollars per share) Investment Company, Investment Income (Loss) from Operations, Per Share Foreign Currency Transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Property & Casualty Insurance 1 Property And Casualty Insurance Sector 1 [Member] Property And Casualty Insurance Sector 1 Period One Period One [Member] Period One Maximum Maximum [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Human Resource & Employment Services Human Resource And Employment Services Sector [Member] Human Resource And Employment Services Sector Less: Fees waived by the Adviser Waived fee Investment Company, Contractual Fee Waived Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Leisure Facilities Leisure Facilities Sector [Member] Leisure Facilities Sector Administration and custody fees payable Administrative Fee Payable Investment, Identifier [Axis] Investment, Identifier [Axis] Cash and cash equivalents Cash and Cash Equivalent, Not Held in Foreign Currency Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Investments,at fair value (cost $1,323,621 and $1,299,169, respectively) Fair Value Senior Secured Loans Investment Owned, Fair Value Personal Care Products Personal Care Products [Member] Personal Care Products Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Asset Coverage per $1000 (in dollars per share) Liabilities Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Payable for investments purchased Payable, Investment, Purchase Entity Shell Company Internet Services And Infrastructure Sector Internet Services And Infrastructure Sector [Member] Internet Services And Infrastructure Sector Average Borrowings Outstanding Long-Term Debt, Average Amount Outstanding Cost Total Investments, Cost Investments, Cost Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] BNP Credit Facility BNP Credit Facility [Member] BNP Credit Facility 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] Statement [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Cargo Ground Transportation Cargo Ground Transportation [Member] Cargo Ground Transportation Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Health Care Services Health Care Services [Member] Health Care Services Measurement Input Type [Axis] Measurement Input Type [Axis] Average yield percentage Investment Company, Average Yield Percentage Investment Company, Average Yield Percentage Application Software Application Software [Member] Application Software Name Measure Name Management fee Management Fee Expense Personal Care Products Personal Care Products Sector [Member] Personal Care Products Sector Industry Sector [Domain] Industry Sector [Domain] Deferred tax liability Deferred Income Tax Liabilities, Net IT Consulting & Other Services IT Consulting And Other Services Sector [Member] IT Consulting And Other Services Sector Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Total Amount Outstanding Health Care Facilities Health Care Facilities Sector [Member] Health Care Facilities Sector Property & Casualty Insurance 3 Property & Casualty Insurance 3 [Member] Property & Casualty Insurance 3 Award Type Award Type [Axis] Legal Entity [Axis] Total assets Assets Insurance Brokers Insurance Brokers [Member] Insurance Brokers Sterling Overnight Index Average Rate Sterling Overnight Index Average Rate [Member] Sterling Overnight Index Average Rate Income Taxes Income Tax, Policy [Policy Text Block] Entity Address, City or Town Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Construction & Engineering Construction & Engineering [Member] Construction & Engineering Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Par Investment Owned, Balance, Principal Amount Electronic Equipment & Instruments Electronic Equipment And Instruments Sector [Member] Electronic Equipment And Instruments Sector Debt instrument, floor rate Debt Instrument, Floor Rate Debt Instrument, Floor Rate Repayments of credit facility 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] Level 2 Fair Value, Inputs, Level 2 [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Related Party Related Party [Member] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Amount Common Stock, Value, Subscriptions Human Resource & Employment Services Human Resource & Employment Services [Member] Human Resource & Employment Services PEO PEO [Member] Electrical Components And Equipment Electrical Components And Equipment Sector [Member] Electrical Components And Equipment Sector Management fee termination period Related Party Transaction, Management Fee Termination Period Related Party Transaction, Management Fee Termination Period 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] Subscription for shares Proceeds from Issuance or Sale of Equity Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Senior Secured Loans - First Lien Senior Secured Loans - First Lien Senior Secured Loans, First Lien [Member] Senior Secured Loans, First Lien Beginning balance Ending balance Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Net increase (decrease) in net assets Stockholders' Equity, Period Increase (Decrease) Other assets Other Assets Fair value at beginning of period Fair value at end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total Investments including Money Market Fund Investments, Fair Value Disclosure Increase (decrease) in interest payable Increase (Decrease) in Interest Payable, Net Purchases of investments Payment for Purchase, Investment, Operating Activity Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Total return Investment Company, Total Return Stated interest expense Interest Expense, Debt, Excluding Amortization Realized and unrealized gains (losses) Realized Gain (Loss), Investment and Derivative, Operating, before Tax [Abstract] Net investment income Investment Company, Distribution, Ordinary Income, Net Investment Company, Distribution, Ordinary Income, Net Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Property & Casualty Insurance Property & Casualty Insurance [Member] Property & Casualty Insurance Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Investment Type Risk Investment Type Risk [Member] Investment Type Risk Total distributions to shareholders Distribution Amount Investment Company, Dividend Distribution Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Investment Portfolio Investment [Text Block] 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] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Hotels Resorts & Cruise Lines Hotels Resorts And Cruise Lines Sector [Member] Hotels Resorts And Cruise Lines Sector Environmental & Facilities Services Environmental And Facilities Services Sector [Member] Environmental And Facilities Services Sector Specialized Consumer Services Specialized Consumer Services Sector [Member] Specialized Consumer Services Sector Net expenses Investment Company, Expense, after Reduction of Fee Waiver and Reimbursement Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Related Party Transactions [Abstract] Related Party Transactions [Abstract] Current Value Method Valuation Technique Current Value Method Valuation Technique [Member] Current Value Method Valuation Technique Due to Adviser Other Liabilities 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] Research & Consulting Services Research & Consulting Services [Member] Research & Consulting Services Money Market Fund Money Market Fund Money Market Funds [Member] PIK rate Investment, Interest Rate, Paid in Kind Qualifying Assets Concentration Risk Qualifying Assets Concentration Risk [Member] Qualifying Assets Concentration Risk Schedule of Investments [Abstract] Schedule of Investments [Abstract] Electrical Components & Equipment Electrical Components & Equipment [Member] Electrical Components & Equipment Entity Ex Transition Period Health Care Equipment Health Care Equipment [Member] Health Care Equipment Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Schedule of Investment Company, Financial Highlights Investment Company, Financial Highlights [Table Text Block] Distributions paid to shareholders Payments of Ordinary Dividends Supplemental disclosure of cash flow information and non-cash financing activities Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Entity Address, State or Province Valuation of Investments Fair Value Measurement, Policy [Policy Text Block] Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Investment Company, Net Assets [Roll Forward] Investment Company, Net Assets [Roll Forward] Common Shares Sold (in shares) Common Stock, Shares Subscribed but Unissued Individual: Individual [Axis] Entity [Domain] Diversified Support Services Diversified Support Services [Member] Diversified Support Services 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] Construction Machinery & Heavy Transportation Equipment Construction Machinery & Heavy Transportation Equipment [Member] Construction Machinery & Heavy Transportation Equipment Cash paid for interest expense Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Fair Value Investments, Fair Value [Abstract] Investments, Fair Value Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Distributions to Shareholders Investment Company, Distribution [Policy Text Block] Entity Interactive Data Current Specialty Chemicals Specialty Chemicals [Member] Specialty Chemicals Equity [Abstract] Equity [Abstract] Segment Reporting Segment Reporting Disclosure [Text Block] Investments, at fair value Investment Owned, Cost Senior Secured Loans Investment Owned, Cost Commitment Fee Rate, Utilization 1 Interest Rate Utilization Level 1 [Member] Interest Rate Utilization Level 1 Air Freight & Logistics Air Freight & Logistics [Member] Air Freight & Logistics 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] Senior Secured Loans - First Lien And Money Market Fund Senior Secured Loans - First Lien And Money Market Fund [Member] Senior Secured Loans - First Lien And Money Market Fund Net change in unrealized appreciation (depreciation) on investments and foreign currencies Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax Research & Consulting Services Research And Consulting Services Sector [Member] Research And Consulting Services Sector Investment Owned, At Fair Value Investment Owned, At Fair Value [Member] Investment Owned, At Fair Value Interest Rate Utilization Level [Axis] Interest Rate Utilization Level [Axis] Interest Rate Utilization Level 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] Net asset value, price per share (in dollars per share) Net asset value, beginning of period (in dollars per share) Net asset value, end of period (in dollars per share) Entity Central Index Key PEO Name PEO Name Highways & Railtracks Highways & Railtracks [Member] Highways & Railtracks Equity Equity, Fair Value Equity, Fair Value 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] Equity Equity [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Subscriptions Investment Company, Capital Subscriptions Investment Company, Capital Subscriptions Revolving Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration (Increase) decrease in other assets Increase (Decrease) in Prepaid Expense and Other Assets Period Two Period Two [Member] Period Two Paid-in-kind interest Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Paid-In-Kind Interest Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Paid-In-Kind Interest Trading Companies & Distributors Trading Companies And Distributors Sector [Member] Trading Companies And Distributors Sector Exercise Price Award Exercise Price Entity Filer Category Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Industry Concentration Risk Industry Concentration Risk [Member] Industry Concentration Risk Increase (decrease) in payable for investments purchased Increase (Decrease) in Payable for Investment Purchased Assets Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Fair Value Fair Value Disclosures [Text Block] Credit Facility [Domain] Credit Facility [Domain] Net change in unrealized appreciation (depreciation) on investments and foreign currencies Debt and Equity Securities, Unrealized Gain (Loss) Net Assets: Deferred Tax Assets, Net [Abstract] 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] Investments, Total Investments, Total [Member] Investments, Total Increase (decrease) in deferred tax liability Increase (Decrease) in Deferred Tax Liability Increase (Decrease) in Deferred Tax Liability Percent of net assets Investment Owned, Net Assets, Percentage Entity Address, Address Line One Entity Address, Address Line Two Deferred Financing Costs Deferred Charges, Policy [Policy Text Block] Investments [Domain] Investments [Domain] Base management fee rate Management and Service Fees, Base Rate Commercial & Residential Mortgage Finance Commercial & Residential Mortgage Finance [Member] Commercial & Residential Mortgage Finance Industry Sector [Axis] Industry Sector [Axis] Schedule of Common Stock Transactions Schedule of Stock by Class [Table Text Block] Investment Company [Abstract] Investment Company [Abstract] Financial Highlights Investment Company, Financial Highlights [Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Interactive Media & Services Interactive Media And Services Sector [Member] Interactive Media And Services Sector Shareholder transactions Investment Company, Capital Share Transaction, Increase (Decrease) [Abstract] Schedule of Valuation Techniques and Significant Unobservable Inputs Used in Recurring Level 3 Fair Value Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Number of operating segments Number of Operating Segments Net accretion/amortization of premiums/discounts Accretion (Amortization) of Discounts and Premiums, Investments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Health Care Technology Health Care Technology [Member] Health Care Technology Increase (decrease) in net assets resulting from operations Net Income (Loss), Including Portion Attributable to Noncontrolling Interest [Abstract] Investment Type [Axis] Investment Type [Axis] Related Party, Type [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Equity Equity, Cost Equity, Cost Distributions to shareholders Distributions from: Investment Company, Distribution to Shareholders [Abstract] Restatement Determination Date: Restatement Determination Date [Axis] Food Distributors Food Distributors Sector [Member] Food Distributors Sector Non-PEO NEO Non-PEO NEO [Member] Property & Casualty Insurance 2 Property & Casualty Insurance 2 [Member] Property & Casualty Insurance 2 Education Services Education Services [Member] Education Services Net realized and unrealized gains (losses) Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax Total interest expense Interest Expense, Debt Name Trading Arrangement, Individual Name Unfunded commitments Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount KKR Funding II KKR Funding II [Member] KKR Funding II All Award Types Award Type [Domain] Schedule of Short-Term Debt [Table] Short-Term Debt [Table] 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 Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Schedule of Investments [Line Items] Schedule of Investments [Line Items] TOTALINVESTMENTS INCLUDING MONEY MARKET FUND Investments, Cost, Percentage Investments, Cost, Percentage MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Other accrued expenses Other Accrued Liabilities Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Total Senior Secured Loans - First And Second Lien, Subordinate Debt, Equity And Money Market Fund [Member] Senior Secured Loans - First And Second Lien, Subordinate Debt, Equity And Money Market Fund Investment income Revenues [Abstract] Systems Software Systems Software [Member] Systems Software Supplemental data Investment Company, Supplemental Data Abstract [Abstract] Investment Company, Supplemental Data Abstract Synthetic Rating Yield Adjustment Measurement Input, Synthetic Rating Yield Adjustment [Member] Measurement Input, Synthetic Rating Yield Adjustment Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair value Fair Value, Investments, Entities that Calculate Net Asset Value, Unfunded Commitments, Adjusted Fair Value, Investments, Entities that Calculate Net Asset Value, Unfunded Commitments, Adjusted Minimum Minimum [Member] Company Selected Measure Name Company Selected Measure Name Interest Rate Utilization Level [Domain] Interest Rate Utilization Level [Domain] Commitment Fee, Period [Domain] Revenue Recognition Revenue [Policy Text Block] Expenses, before waiver Investment Company, Expense Ratio before Incentive Allocation Debt Obligations Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Portfolio turnover rate Investment Company, Portfolio Turnover Commitment Fee Rate, Utilization 3 Interest Rate Utilization Level 3 [Member] Interest Rate Utilization Level 3 Net change in unrealized appreciation (depreciation) Debt and Equity Securities, Unrealized Gain (Loss) [Member] Debt and Equity Securities, Unrealized Gain (Loss) Interest payable Interest Payable Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Proceeds from sale and repayments of investments Proceeds from Disposition of Investment, Operating Activity Benefit (provision) for income taxes Benefit (provision) for income taxes Gain (Loss), Investment and Derivative, Operating, Tax Expense (Benefit) Subordinated Debt Subordinated Debt [Member] All Executive Categories All Executive Categories [Member] Common Shares, $0.001 par value, unlimited shares authorized, 699,385 and 686,508 shares issued and outstanding, respectively Common Stock, Value, Issued Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Commitments and contingencies (Note 8) Commitments and Contingencies Increase from shareholder transactions Investment Company, Capital Share Transaction, Increase (Decrease) Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Small Business Range (Weighted Average) Investment Company, Investment Owned, Measurement Input Net investment income, after waiver Investment Company, Investment Income (Loss) Ratio, after Incentive Allocation Distribution payable Distribution Payable Document Transition Report IT Consulting & Other Services IT Consulting & Other Services [Member] IT Consulting & Other Services Assets, Total Assets, Total [Member] Underlying Securities Award Underlying Securities Amount Short-Term Debt [Line Items] Short-Term Debt [Line Items] Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Proceeds from credit facility Proceeds from Lines of Credit Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Schedule of Investments [Table] Schedule of Investments [Table] Amortization of deferred financing costs Amortization of Debt Discount (Premium) Insurance Brokers Insurance Sector [Member] Document Type Citibank Credit Facility Citibank Credit Facility [Member] Citibank Credit Facility Level 3 Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Capital in excess of par value Additional Paid in Capital Aerospace & Defense Aerospace & Defense [Member] Aerospace & Defense Subordinated Debt Subordinated Debt, Cost Subordinated Debt, Cost All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Distribution per share (in dollars per share) Total distributions (in dollars per share) Investment Company, Distribution to Shareholders, Per Share Money Market Funds, Fair Value Money Market Funds, Fair Value Disclosure Money Market Funds, Fair Value Disclosure Statistical Measurement [Axis] Statistical Measurement [Axis] 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] Commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Weighted average interest rate Debt, Weighted Average Interest Rate 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 Internet Services & Infrastructure Internet Services & Infrastructure [Member] Internet Services & Infrastructure Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Asset Management & Custody Banks Asset Management & Custody Banks [Member] Asset Management & Custody Banks Paid-in-kind interest Paid-in-Kind Interest, Net Paid-in-Kind Interest, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Shares (in shares) Investments, Shares Investments, Shares Level 1 Fair Value, Inputs, Level 1 [Member] Credit facility Long-Term Line of Credit Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Increase (decrease) in other accrued expenses Increase (Decrease) in Other Accrued Liabilities Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] NTM EBITDA Multiple Measurement Input, NTM EBITDA Multiple [Member] Measurement Input, NTM EBITDA Multiple Yield Measurement Input, Yield [Member] Measurement Input, Yield Reinvestment of distributions Stock Issued During Period, Value, Dividend Reinvestment Plan Net investment income Net investment income Investment Income, Operating, after Expense and Tax Schedule of Investment Company, Distribution to Shareholders Investment Company, Distribution To Shareholders [Table Text Block] Investment Company, Distribution To Shareholders Diversified Financial Services Diversified Financial Services [Member] Diversified Financial Services Net investment income, before waiver Investment Company, Investment Income (Loss) Ratio, before Incentive Allocation Interest income Interest Income, Operating, Paid in Cash Administration and custody fees Administrative Fees Expense Management annual rate Management and Service Fees, Rate Food Distributors Food Distributors [Member] Food Distributors Net investment income (in dollars per share) Investment Company, Distribution To Shareholder From Net Investment Income Investment Company, Distribution To Shareholder From Net Investment Income Money Market Fund Money Market Funds, at Carrying Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Consumer Finance Consumer Finance [Member] Consumer Finance Award Timing Disclosures [Line Items] Hotels, Resorts & Cruise Lines Hotels, Resorts & Cruise Lines [Member] Hotels, Resorts & Cruise Lines Unused commitment fees Debt Instrument, Unused Borrowing Capacity, Fee Income from investment operations: Investment Company, Investment Income (Loss) from Operations, Per Share [Abstract] Basis spread on variable rate Investment, Basis Spread, Variable Rate Shareholder Transactions Equity [Text Block] Electronic Equipment & Instruments Electronic Equipment & Instruments [Member] Electronic Equipment & Instruments Current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Shares Investment Owned, Balance, Shares Net increase (decrease) in net assets resulting from operations Net increase (decrease) in net assets resulting from operations Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Net investment income (in dollars per share) Investment Company, Investment Income (Loss), Per Share, Basic Qualifying assets as a percent of total assets Qualifying Assets, Percent Of Total Assets Qualifying Assets, Percent Of Total Assets Interest income - PIK Interest Income, Operating, Paid in Kind Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average [Member] Canadian Overnight Repo Rate Average Directors’ fees Directors’ Fees Directors’ Fees Investments Investments [Member] Health Care Supplies Health Care Supplies [Member] Health Care Supplies Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Ratio to average net assets Investment Company, Ratio To Average Net Assets And Supplemental Data [Abstract] Investment Company, Ratio To Average Net Assets And Supplemental Data Schedule of the Composition of Investment Portfolio Investment Holdings, Schedule of Investments [Table Text Block] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Line of Credit Line of Credit [Member] Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Expenses, after waiver Investment Company, Expense Ratio, after Fee Waiver and Incentive Fee Deduction Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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] Executive Category: Executive Category [Axis] Interest expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Increase (decrease) in due to Adviser Increase (Decrease) in Due to Related Parties Changes in operating assets and liabilities: Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] 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] Professional fees Professional Fees Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Subordinated Debt Subordinated Debt, Fair Value Subordinated Debt, Fair Value Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Aerospace And Defense Aerospace And Defense Sector [Member] Aerospace And Defense Sector Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Systems Software Systems Software Sector [Member] Systems Software Sector Variable Rate [Domain] Variable Rate [Domain] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Trading Companies & Distributors Trading Companies & Distributors [Member] Trading Companies & Distributors Health Care Services Health Care Services Sector [Member] Health Care Services Sector Schedule of Reconciliation Fair Value, Assets Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Termination Date Trading Arrangement Termination Date Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] LTM EBITDA Multiple Measurement Input, LTM EBITDA Multiple [Member] Measurement Input, LTM EBITDA Multiple Measure: Measure [Axis] Environmental & Facilities Services Environmental & Facilities Services [Member] Environmental & Facilities Services Net Assets Net Assets Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Schedule of Fair Value Hierarchy Fair Value, Assets Measured on Recurring Basis [Table Text Block] Per Share Operating Performance Investment Company, Financial Highlights [Roll Forward] Interest receivable Dividend and Interest Receivable Fwd EBITDA Multiple Measurement Input, Fwd EBITDA Multiple [Member] Measurement Input, Fwd EBITDA Multiple Investments Owned And Money Markets, Fair Value Investments Owned And Money Markets, Fair Value Investments Owned And Money Markets, Fair Value Cost Investments, At Cost [Abstract] Investments, At Cost Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [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 expenses Investment Income, Investment Expense Entity Tax Identification Number Euro Interbank Offered Rate Euro Interbank Offered Rate [Member] Euro Interbank Offered Rate Health Care Equipment Health Care Equipment Sector [Member] Health Care Equipment Sector Directors’ fees payable Accrued Professional Fees Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Period [Domain] Period [Domain] Period [Domain] Common Shares Investment Company, Per Share Data [Abstract] Investment Company, Per Share Data Specialized Consumer Services Specialized Consumer Services [Member] Specialized Consumer Services Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Other assets in excess of liabilities percentage Noninvestment Asset Less Noninvestment Liability, Percent of Net Asset Subscription receivable Subscription Receivable Subscription Receivable LIABILITIES EXCEEDING OTHER ASSETS, NET Noninvestment Assets Less Noninvestment Liabilities Period [Axis] Period [Axis] Period Sales and repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Accretion of discount (amortization of premium) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Accretion Of Discount (Amortization Of Premium) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Accretion Of Discount (Amortization Of Premium) Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Money Market Fund Money Market Funds, Cost Money Market Funds, Cost Total liabilities Liabilities Cash and Cash Equivalents: Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation [Abstract] Increase (decrease) in administration and custody fees payable Increase (Decrease) in Administrative Fee Payable Increase commitment amount Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Specialty Chemicals Specialty Chemicals Sector [Member] Specialty Chemicals Sector Expenses Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Asset Class [Domain] Asset Class [Domain] Publishing Publishing [Member] Publishing Net change in unrealized appreciation (depreciation) and net realized gain (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Statement [Line Items] Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] 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] Total investment income Gross Investment Income, Operating Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net Increase (Decrease) in Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation