3.25.4 html 1974 425 1 false 207 0 false 8 false false R1.htm 995200090 - Document - Document and Entity Information Sheet http://stelluscapital.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 995200100 - Statement - CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES Sheet http://stelluscapital.com/role/StatementConsolidatedStatementsOfAssetsAndLiabilities CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES Statements 2 false false R3.htm 995200105 - Statement - CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Parenthetical) Sheet http://stelluscapital.com/role/StatementConsolidatedStatementsOfAssetsAndLiabilitiesParenthetical CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Parenthetical) Statements 3 false false R4.htm 995200200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://stelluscapital.com/role/StatementConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 995200300 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS Sheet http://stelluscapital.com/role/StatementConsolidatedStatementsOfChangesInNetAssets CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS Statements 5 false false R6.htm 995200400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://stelluscapital.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 6 false false R7.htm 995200500 - Statement - CONSOLIDATED SCHEDULE OF INVESTMENTS Sheet http://stelluscapital.com/role/StatementConsolidatedScheduleOfInvestments CONSOLIDATED SCHEDULE OF INVESTMENTS Statements 7 false false R8.htm 995210101 - Disclosure - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES Sheet http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPolicies NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES Notes 8 false false R9.htm 995210201 - Disclosure - RELATED PARTY ARRANGEMENTS Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangements RELATED PARTY ARRANGEMENTS Notes 9 false false R10.htm 995210301 - Disclosure - DISTRIBUTIONS Sheet http://stelluscapital.com/role/DisclosureDistributions DISTRIBUTIONS Notes 10 false false R11.htm 995210401 - Disclosure - EQUITY OFFERINGS AND RELATED EXPENSES Sheet http://stelluscapital.com/role/DisclosureEquityOfferingsAndRelatedExpenses EQUITY OFFERINGS AND RELATED EXPENSES Notes 11 false false R12.htm 995210501 - Disclosure - NET INCREASE IN NET ASSETS PER COMMON SHARE OF BENEFICIAL INTEREST Sheet http://stelluscapital.com/role/DisclosureNetIncreaseInNetAssetsPerCommonShareOfBeneficialInterest NET INCREASE IN NET ASSETS PER COMMON SHARE OF BENEFICIAL INTEREST Notes 12 false false R13.htm 995210601 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValue PORTFOLIO INVESTMENTS AND FAIR VALUE Notes 13 false false R14.htm 995210701 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://stelluscapital.com/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 14 false false R15.htm 995210801 - Disclosure - FINANCIAL HIGHLIGHTS Sheet http://stelluscapital.com/role/DisclosureFinancialHighlights FINANCIAL HIGHLIGHTS Notes 15 false false R16.htm 995210901 - Disclosure - CREDIT FACILITIES Sheet http://stelluscapital.com/role/DisclosureCreditFacilities CREDIT FACILITIES Notes 16 false false R17.htm 995211001 - Disclosure - INCOME TAXES Sheet http://stelluscapital.com/role/DisclosureIncomeTaxes INCOME TAXES Notes 17 false false R18.htm 995211101 - Disclosure - SENIOR SECURITIES Sheet http://stelluscapital.com/role/DisclosureSeniorSecurities SENIOR SECURITIES Notes 18 false false R19.htm 995211201 - Disclosure - REPORTABLE SEGMENTS Sheet http://stelluscapital.com/role/DisclosureReportableSegments REPORTABLE SEGMENTS Notes 19 false false R20.htm 995211301 - Disclosure - SUBSEQUENT EVENTS Sheet http://stelluscapital.com/role/DisclosureSubsequentEvents SUBSEQUENT EVENTS Notes 20 false false R21.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 21 false false R22.htm 995443 - Disclosure - Award Timing Disclosure Sheet http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure Award Timing Disclosure Notes 22 false false R23.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 23 false false R24.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 24 false false R25.htm 995470 - Disclosure - N-2 Sheet http://xbrl.sec.gov/cef/role/N2 N-2 Notes 25 false false R26.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 26 false false R27.htm 99920102 - Disclosure - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPoliciesPolicies NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 27 false false R28.htm 99930103 - Disclosure - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Tables) Sheet http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPoliciesTables NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Tables) Tables http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPolicies 28 false false R29.htm 99930203 - Disclosure - RELATED PARTY ARRANGEMENTS (Tables) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsTables RELATED PARTY ARRANGEMENTS (Tables) Tables http://stelluscapital.com/role/DisclosureRelatedPartyArrangements 29 false false R30.htm 99930303 - Disclosure - DISTRIBUTIONS (Tables) Sheet http://stelluscapital.com/role/DisclosureDistributionsTables DISTRIBUTIONS (Tables) Tables http://stelluscapital.com/role/DisclosureDistributions 30 false false R31.htm 99930403 - Disclosure - EQUITY OFFERINGS AND RELATED EXPENSES (Tables) Sheet http://stelluscapital.com/role/DisclosureEquityOfferingsAndRelatedExpensesTables EQUITY OFFERINGS AND RELATED EXPENSES (Tables) Tables http://stelluscapital.com/role/DisclosureEquityOfferingsAndRelatedExpenses 31 false false R32.htm 99930503 - Disclosure - NET INCREASE IN NET ASSETS PER COMMON SHARE OF BENEFICIAL INTEREST (Tables) Sheet http://stelluscapital.com/role/DisclosureNetIncreaseInNetAssetsPerCommonShareOfBeneficialInterestTables NET INCREASE IN NET ASSETS PER COMMON SHARE OF BENEFICIAL INTEREST (Tables) Tables http://stelluscapital.com/role/DisclosureNetIncreaseInNetAssetsPerCommonShareOfBeneficialInterest 32 false false R33.htm 99930603 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE (Tables) Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValueTables PORTFOLIO INVESTMENTS AND FAIR VALUE (Tables) Tables http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValue 33 false false R34.htm 99930803 - Disclosure - FINANCIAL HIGHLIGHTS (Tables) Sheet http://stelluscapital.com/role/DisclosureFinancialHighlightsTables FINANCIAL HIGHLIGHTS (Tables) Tables http://stelluscapital.com/role/DisclosureFinancialHighlights 34 false false R35.htm 99930903 - Disclosure - CREDIT FACILITIES (Tables) Sheet http://stelluscapital.com/role/DisclosureCreditFacilitiesTables CREDIT FACILITIES (Tables) Tables http://stelluscapital.com/role/DisclosureCreditFacilities 35 false false R36.htm 99931003 - Disclosure - INCOME TAXES (Tables) Sheet http://stelluscapital.com/role/DisclosureIncomeTaxesTables INCOME TAXES (Tables) Tables http://stelluscapital.com/role/DisclosureIncomeTaxes 36 false false R37.htm 99931103 - Disclosure - SENIOR SECURITIES (Tables) Sheet http://stelluscapital.com/role/DisclosureSeniorSecuritiesTables SENIOR SECURITIES (Tables) Tables http://stelluscapital.com/role/DisclosureSeniorSecurities 37 false false R38.htm 99931303 - Disclosure - SUBSEQUENT EVENTS (Tables) Sheet http://stelluscapital.com/role/DisclosureSubsequentEventsTables SUBSEQUENT EVENTS (Tables) Tables http://stelluscapital.com/role/DisclosureSubsequentEvents 38 false false R39.htm 99940101 - Disclosure - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Nature of Operations (Details) Sheet http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPoliciesNatureOfOperationsDetails NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Nature of Operations (Details) Details 39 false false R40.htm 99940102 - Disclosure - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) Sheet http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPoliciesCashAndCashEquivalentsDetails NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) Details 40 false false R41.htm 99940104 - Disclosure - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) Sheet http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPoliciesRevenueRecognitionDetails NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) Details 41 false false R42.htm 99940105 - Disclosure - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - U.S. Federal Income Taxes (Details) Sheet http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPoliciesUsFederalIncomeTaxesDetails NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - U.S. Federal Income Taxes (Details) Details 42 false false R43.htm 99940106 - Disclosure - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Distributable Earnings (Details) Sheet http://stelluscapital.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPoliciesDistributableEarningsDetails NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Distributable Earnings (Details) Details 43 false false R44.htm 99940201 - Disclosure - RELATED PARTY ARRANGEMENTS - Investment Advisory Agreement (Details) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsInvestmentAdvisoryAgreementDetails RELATED PARTY ARRANGEMENTS - Investment Advisory Agreement (Details) Details 44 false false R45.htm 99940202 - Disclosure - RELATED PARTY ARRANGEMENTS - Income-Based Incentive Fee (Details) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsIncomeBasedIncentiveFeeDetails RELATED PARTY ARRANGEMENTS - Income-Based Incentive Fee (Details) Details 45 false false R46.htm 99940203 - Disclosure - RELATED PARTY ARRANGEMENTS - Capital Gains Incentive Fee (Details) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsCapitalGainsIncentiveFeeDetails RELATED PARTY ARRANGEMENTS - Capital Gains Incentive Fee (Details) Details 46 false false R47.htm 99940204 - Disclosure - RELATED PARTY ARRANGEMENTS - Components of Incentive Fees (Details) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsComponentsOfIncentiveFeesDetails RELATED PARTY ARRANGEMENTS - Components of Incentive Fees (Details) Details 47 false false R48.htm 99940205 - Disclosure - RELATED PARTY ARRANGEMENTS - Expense Support and Conditional Reimbursement (Details) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsExpenseSupportAndConditionalReimbursementDetails RELATED PARTY ARRANGEMENTS - Expense Support and Conditional Reimbursement (Details) Details 48 false false R49.htm 99940206 - Disclosure - RELATED PARTY ARRANGEMENTS - Components of Expenses Reimbursed/Fees Waived (Details) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsComponentsOfExpensesReimbursedFeesWaivedDetails RELATED PARTY ARRANGEMENTS - Components of Expenses Reimbursed/Fees Waived (Details) Details 49 false false R50.htm 99940207 - Disclosure - RELATED PARTY ARRANGEMENTS - Trustees' Fees (Details) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsTrusteesFeesDetails RELATED PARTY ARRANGEMENTS - Trustees' Fees (Details) Details 50 false false R51.htm 99940208 - Disclosure - RELATED PARTY ARRANGEMENTS - Administration Agreement (Details) Sheet http://stelluscapital.com/role/DisclosureRelatedPartyArrangementsAdministrationAgreementDetails RELATED PARTY ARRANGEMENTS - Administration Agreement (Details) Details 51 false false R52.htm 99940301 - Disclosure - DISTRIBUTIONS - Additional Information (Details) Sheet http://stelluscapital.com/role/DisclosureDistributionsAdditionalInformationDetails DISTRIBUTIONS - Additional Information (Details) Details 52 false false R53.htm 99940302 - Disclosure - DISTRIBUTIONS (Details) Sheet http://stelluscapital.com/role/DisclosureDistributionsDetails DISTRIBUTIONS (Details) Details http://stelluscapital.com/role/DisclosureDistributionsTables 53 false false R54.htm 99940401 - Disclosure - EQUITY OFFERINGS AND RELATED EXPENSES - Additional Information (Details) Sheet http://stelluscapital.com/role/DisclosureEquityOfferingsAndRelatedExpensesAdditionalInformationDetails EQUITY OFFERINGS AND RELATED EXPENSES - Additional Information (Details) Details 54 false false R55.htm 99940402 - Disclosure - EQUITY OFFERINGS AND RELATED EXPENSES - Issuance of Common Stock (Details) Sheet http://stelluscapital.com/role/DisclosureEquityOfferingsAndRelatedExpensesIssuanceOfCommonStockDetails EQUITY OFFERINGS AND RELATED EXPENSES - Issuance of Common Stock (Details) Details 55 false false R56.htm 99940403 - Disclosure - EQUITY OFFERINGS AND RELATED EXPENSES - Share Repurchase Program (Details) Sheet http://stelluscapital.com/role/DisclosureEquityOfferingsAndRelatedExpensesShareRepurchaseProgramDetails EQUITY OFFERINGS AND RELATED EXPENSES - Share Repurchase Program (Details) Details 56 false false R57.htm 99940501 - Disclosure - NET INCREASE IN NET ASSETS PER COMMON SHARE OF BENEFICIAL INTEREST (Details) Sheet http://stelluscapital.com/role/DisclosureNetIncreaseInNetAssetsPerCommonShareOfBeneficialInterestDetails NET INCREASE IN NET ASSETS PER COMMON SHARE OF BENEFICIAL INTEREST (Details) Details http://stelluscapital.com/role/DisclosureNetIncreaseInNetAssetsPerCommonShareOfBeneficialInterestTables 57 false false R58.htm 99940601 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE - Total Fair Value and Cost of Investments (Details) Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValueTotalFairValueAndCostOfInvestmentsDetails PORTFOLIO INVESTMENTS AND FAIR VALUE - Total Fair Value and Cost of Investments (Details) Details 58 false false R59.htm 99940602 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate gross unrealized appreciation and depreciation and aggregate cost and fair value of portfolio company securities (Details) Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValueAggregateGrossUnrealizedAppreciationAndDepreciationAndAggregateCostAndFairValueOfPortfolioCompanySecuritiesDetails PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate gross unrealized appreciation and depreciation and aggregate cost and fair value of portfolio company securities (Details) Details 59 false false R60.htm 99940603 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE - Fair values of investments disaggregated into three levels of fair value hierarchy (Details) Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValueFairValuesOfInvestmentsDisaggregatedIntoThreeLevelsOfFairValueHierarchyDetails PORTFOLIO INVESTMENTS AND FAIR VALUE - Fair values of investments disaggregated into three levels of fair value hierarchy (Details) Details 60 false false R61.htm 99940604 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate values of Level 3 portfolio investments change (Details) Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValueAggregateValuesOfLevel3PortfolioInvestmentsChangeDetails PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate values of Level 3 portfolio investments change (Details) Details 61 false false R62.htm 99940605 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE - Geographical concentration of investment portfolio (Details) Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValueGeographicalConcentrationOfInvestmentPortfolioDetails PORTFOLIO INVESTMENTS AND FAIR VALUE - Geographical concentration of investment portfolio (Details) Details 62 false false R63.htm 99940606 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE - Industry concentration of investment portfolio (Details) Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValueIndustryConcentrationOfInvestmentPortfolioDetails PORTFOLIO INVESTMENTS AND FAIR VALUE - Industry concentration of investment portfolio (Details) Details 63 false false R64.htm 99940607 - Disclosure - PORTFOLIO INVESTMENTS AND FAIR VALUE - Quantitative information about Level 3 fair value measurements (Details) Sheet http://stelluscapital.com/role/DisclosurePortfolioInvestmentsAndFairValueQuantitativeInformationAboutLevel3FairValueMeasurementsDetails PORTFOLIO INVESTMENTS AND FAIR VALUE - Quantitative information about Level 3 fair value measurements (Details) Details 64 false false R65.htm 99940701 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://stelluscapital.com/role/DisclosureCommitmentsAndContingenciesDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://stelluscapital.com/role/DisclosureCommitmentsAndContingencies 65 false false R66.htm 99940801 - Disclosure - FINANCIAL HIGHLIGHTS - Roll Forward (Details) Sheet http://stelluscapital.com/role/DisclosureFinancialHighlightsRollForwardDetails FINANCIAL HIGHLIGHTS - Roll Forward (Details) Details 66 false false R67.htm 99940802 - Disclosure - FINANCIAL HIGHLIGHTS - Additional Information (Details) Sheet http://stelluscapital.com/role/DisclosureFinancialHighlightsAdditionalInformationDetails FINANCIAL HIGHLIGHTS - Additional Information (Details) Details 67 false false R68.htm 99940901 - Disclosure - CREDIT FACILITIES - Additional Information (Details) Sheet http://stelluscapital.com/role/DisclosureCreditFacilitiesAdditionalInformationDetails CREDIT FACILITIES - Additional Information (Details) Details 68 false false R69.htm 99940902 - Disclosure - CREDIT FACILITIES - Summary of credit facility (Details) Sheet http://stelluscapital.com/role/DisclosureCreditFacilitiesSummaryOfCreditFacilityDetails CREDIT FACILITIES - Summary of credit facility (Details) Details 69 false false R70.htm 99940903 - Disclosure - CREDIT FACILITIES - Summary of interest expense and amortized financing costs on credit facility (Details) Sheet http://stelluscapital.com/role/DisclosureCreditFacilitiesSummaryOfInterestExpenseAndAmortizedFinancingCostsOnCreditFacilityDetails CREDIT FACILITIES - Summary of interest expense and amortized financing costs on credit facility (Details) Details 70 false false R71.htm 99941001 - Disclosure - INCOME TAXES - Distributions paid to common stockholders (Details) Sheet http://stelluscapital.com/role/DisclosureIncomeTaxesDistributionsPaidToCommonStockholdersDetails INCOME TAXES - Distributions paid to common stockholders (Details) Details 71 false false R72.htm 99941002 - Disclosure - INCOME TAXES - Reconciliation to taxable income and distributions declared (Details) Sheet http://stelluscapital.com/role/DisclosureIncomeTaxesReconciliationToTaxableIncomeAndDistributionsDeclaredDetails INCOME TAXES - Reconciliation to taxable income and distributions declared (Details) Details 72 false false R73.htm 99941003 - Disclosure - INCOME TAXES - Aggregate gross unrealized appreciation and depreciation and aggregate cost of Company portfolio company securities (Details) Sheet http://stelluscapital.com/role/DisclosureIncomeTaxesAggregateGrossUnrealizedAppreciationAndDepreciationAndAggregateCostOfCompanyPortfolioCompanySecuritiesDetails INCOME TAXES - Aggregate gross unrealized appreciation and depreciation and aggregate cost of Company portfolio company securities (Details) Details 73 false false R74.htm 99941004 - Disclosure - INCOME TAXES - Additional Information (Details) Sheet http://stelluscapital.com/role/DisclosureIncomeTaxesAdditionalInformationDetails INCOME TAXES - Additional Information (Details) Details 74 false false R75.htm 99941005 - Disclosure - INCOME TAXES - Tax Position (Details) Sheet http://stelluscapital.com/role/DisclosureIncomeTaxesTaxPositionDetails INCOME TAXES - Tax Position (Details) Details 75 false false R76.htm 99941101 - Disclosure - SENIOR SECURITIES (Details) Sheet http://stelluscapital.com/role/DisclosureSeniorSecuritiesDetails SENIOR SECURITIES (Details) Details http://stelluscapital.com/role/DisclosureSeniorSecuritiesTables 76 false false R77.htm 99941301 - Disclosure - SUBSEQUENT EVENTS - Investment Portfolio (Details) Sheet http://stelluscapital.com/role/DisclosureSubsequentEventsInvestmentPortfolioDetails SUBSEQUENT EVENTS - Investment Portfolio (Details) Details 77 false false R78.htm 99941302 - Disclosure - SUBSEQUENT EVENTS - Credit Facilities (Details) Sheet http://stelluscapital.com/role/DisclosureSubsequentEventsCreditFacilitiesDetails SUBSEQUENT EVENTS - Credit Facilities (Details) Details 78 false false R79.htm 99941303 - Disclosure - SUBSEQUENT EVENTS - Dividends Declared (Details) Sheet http://stelluscapital.com/role/DisclosureSubsequentEventsDividendsDeclaredDetails SUBSEQUENT EVENTS - Dividends Declared (Details) Details 79 false false All Reports Book All Reports tmb-20251231.xsd tmb-20251231_cal.xml tmb-20251231_def.xml tmb-20251231_lab.xml tmb-20251231_pre.xml tmb-20251231x10k.htm tmb-20251231x10k007.jpg http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cef/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true