3.23.1 html 2667 303 1 false 179 0 false 8 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.monroebdc.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES Sheet http://www.monroebdc.com/role/StatementConsolidatedStatementsOfAssetsAndLiabilities CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES Statements 2 false false R3.htm 00105 - Statement - CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Parenthetical) Sheet http://www.monroebdc.com/role/StatementConsolidatedStatementsOfAssetsAndLiabilitiesParenthetical CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.monroebdc.com/role/StatementConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 00300 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS Sheet http://www.monroebdc.com/role/StatementConsolidatedStatementsOfChangesInNetAssets CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS Statements 5 false false R6.htm 00400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.monroebdc.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 6 false false R7.htm 00405 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Sheet http://www.monroebdc.com/role/StatementConsolidatedStatementsOfCashFlowsParenthetical CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Statements 7 false false R8.htm 00500 - Statement - CONSOLIDATED SCHEDULE OF INVESTMENTS Sheet http://www.monroebdc.com/role/StatementConsolidatedScheduleOfInvestments CONSOLIDATED SCHEDULE OF INVESTMENTS Statements 8 false false R9.htm 00505 - Statement - CONSOLIDATED SCHEDULE OF INVESTMENTS (Foreign currency forward contracts) Sheet http://www.monroebdc.com/role/StatementConsolidatedScheduleOfInvestmentsForeignCurrencyForwardContracts CONSOLIDATED SCHEDULE OF INVESTMENTS (Foreign currency forward contracts) Statements 9 false false R10.htm 00510 - Statement - CONSOLIDATED SCHEDULE OF INVESTMENTS (Parenthetical) Sheet http://www.monroebdc.com/role/StatementConsolidatedScheduleOfInvestmentsParenthetical CONSOLIDATED SCHEDULE OF INVESTMENTS (Parenthetical) Statements 10 false false R11.htm 10101 - Disclosure - Organization and Principal Business Sheet http://www.monroebdc.com/role/DisclosureOrganizationAndPrincipalBusiness Organization and Principal Business Notes 11 false false R12.htm 10201 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.monroebdc.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 12 false false R13.htm 10301 - Disclosure - Investments Sheet http://www.monroebdc.com/role/DisclosureInvestments Investments Notes 13 false false R14.htm 10401 - Disclosure - Fair Value Measurements Sheet http://www.monroebdc.com/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 14 false false R15.htm 10501 - Disclosure - Transactions with Affiliated Companies Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithAffiliatedCompanies Transactions with Affiliated Companies Notes 15 false false R16.htm 10601 - Disclosure - Transactions with Related Parties Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithRelatedParties Transactions with Related Parties Notes 16 false false R17.htm 10701 - Disclosure - Borrowings Sheet http://www.monroebdc.com/role/DisclosureBorrowings Borrowings Notes 17 false false R18.htm 10801 - Disclosure - Derivative Instruments Sheet http://www.monroebdc.com/role/DisclosureDerivativeInstruments Derivative Instruments Notes 18 false false R19.htm 10901 - Disclosure - Distributions Sheet http://www.monroebdc.com/role/DisclosureDistributions Distributions Notes 19 false false R20.htm 11001 - Disclosure - Stock Issuances and Share Repurchase Program Sheet http://www.monroebdc.com/role/DisclosureStockIssuancesAndShareRepurchaseProgram Stock Issuances and Share Repurchase Program Notes 20 false false R21.htm 11101 - Disclosure - Commitments and Contingencies Sheet http://www.monroebdc.com/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 21 false false R22.htm 11201 - Disclosure - Financial Highlights Sheet http://www.monroebdc.com/role/DisclosureFinancialHighlights Financial Highlights Notes 22 false false R23.htm 11301 - Disclosure - Subsequent Events Sheet http://www.monroebdc.com/role/DisclosureSubsequentEvents Subsequent Events Notes 23 false false R24.htm 20202 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.monroebdc.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.monroebdc.com/role/DisclosureSummaryOfSignificantAccountingPolicies 24 false false R25.htm 30203 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.monroebdc.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.monroebdc.com/role/DisclosureSummaryOfSignificantAccountingPolicies 25 false false R26.htm 30303 - Disclosure - Investments (Tables) Sheet http://www.monroebdc.com/role/DisclosureInvestmentsTables Investments (Tables) Tables http://www.monroebdc.com/role/DisclosureInvestments 26 false false R27.htm 30403 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.monroebdc.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.monroebdc.com/role/DisclosureFairValueMeasurements 27 false false R28.htm 30503 - Disclosure - Transactions with Affiliated Companies (Tables) Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithAffiliatedCompaniesTables Transactions with Affiliated Companies (Tables) Tables http://www.monroebdc.com/role/DisclosureTransactionsWithAffiliatedCompanies 28 false false R29.htm 30603 - Disclosure - Transactions with Related Parties (Tables) Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithRelatedPartiesTables Transactions with Related Parties (Tables) Tables http://www.monroebdc.com/role/DisclosureTransactionsWithRelatedParties 29 false false R30.htm 30703 - Disclosure - Borrowings (Tables) Sheet http://www.monroebdc.com/role/DisclosureBorrowingsTables Borrowings (Tables) Tables http://www.monroebdc.com/role/DisclosureBorrowings 30 false false R31.htm 30803 - Disclosure - Derivative Instruments (Tables) Sheet http://www.monroebdc.com/role/DisclosureDerivativeInstrumentsTables Derivative Instruments (Tables) Tables http://www.monroebdc.com/role/DisclosureDerivativeInstruments 31 false false R32.htm 30903 - Disclosure - Distributions (Tables) Sheet http://www.monroebdc.com/role/DisclosureDistributionsTables Distributions (Tables) Tables http://www.monroebdc.com/role/DisclosureDistributions 32 false false R33.htm 31003 - Disclosure - Stock Issuances and Share Repurchase Program (Tables) Sheet http://www.monroebdc.com/role/DisclosureStockIssuancesAndShareRepurchaseProgramTables Stock Issuances and Share Repurchase Program (Tables) Tables http://www.monroebdc.com/role/DisclosureStockIssuancesAndShareRepurchaseProgram 33 false false R34.htm 31203 - Disclosure - Financial Highlights (Tables) Sheet http://www.monroebdc.com/role/DisclosureFinancialHighlightsTables Financial Highlights (Tables) Tables http://www.monroebdc.com/role/DisclosureFinancialHighlights 34 false false R35.htm 31303 - Disclosure - Subsequent Events (Tables) Sheet http://www.monroebdc.com/role/DisclosureSubsequentEventsTables Subsequent Events (Tables) Tables http://www.monroebdc.com/role/DisclosureSubsequentEvents 35 false false R36.htm 40201 - Disclosure - Summary of Significant Accounting Policies - Revenue Recognition (Details) Sheet http://www.monroebdc.com/role/DisclosureSummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails Summary of Significant Accounting Policies - Revenue Recognition (Details) Details 36 false false R37.htm 40202 - Disclosure - Summary of Significant Accounting Policies - Components of the Company's investment income (Details) Sheet http://www.monroebdc.com/role/DisclosureSummaryOfSignificantAccountingPoliciesComponentsOfCompanySInvestmentIncomeDetails Summary of Significant Accounting Policies - Components of the Company's investment income (Details) Details 37 false false R38.htm 40203 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://www.monroebdc.com/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies - Additional Information (Details) Details 38 false false R39.htm 40301 - Disclosure - Investments - Composition of the Company's investment portfolio, at amortized cost and fair value (with corresponding percentage of total portfolio investments) (Details) Sheet http://www.monroebdc.com/role/DisclosureInvestmentsCompositionOfCompanySInvestmentPortfolioAtAmortizedCostAndFairValueWithCorrespondingPercentageOfTotalPortfolioInvestmentsDetails Investments - Composition of the Company's investment portfolio, at amortized cost and fair value (with corresponding percentage of total portfolio investments) (Details) Details 39 false false R40.htm 40302 - Disclosure - Investments - Composition of the Company's investment portfolio by geographic region, at amortized cost and fair value (with corresponding percentage of total portfolio investments) (Details) Sheet http://www.monroebdc.com/role/DisclosureInvestmentsCompositionOfCompanySInvestmentPortfolioByGeographicRegionAtAmortizedCostAndFairValueWithCorrespondingPercentageOfTotalPortfolioInvestmentsDetails Investments - Composition of the Company's investment portfolio by geographic region, at amortized cost and fair value (with corresponding percentage of total portfolio investments) (Details) Details 40 false false R41.htm 40303 - Disclosure - Investments - Composition of the Company's investment portfolio by industry, at amortized cost and fair value (with corresponding percentage of total portfolio investments) (Details) Sheet http://www.monroebdc.com/role/DisclosureInvestmentsCompositionOfCompanySInvestmentPortfolioByIndustryAtAmortizedCostAndFairValueWithCorrespondingPercentageOfTotalPortfolioInvestmentsDetails Investments - Composition of the Company's investment portfolio by industry, at amortized cost and fair value (with corresponding percentage of total portfolio investments) (Details) Details 41 false false R42.htm 40304 - Disclosure - Investments - MRCC Senior Loan Fund I, LLC (Details) Sheet http://www.monroebdc.com/role/DisclosureInvestmentsMrccSeniorLoanFundILlcDetails Investments - MRCC Senior Loan Fund I, LLC (Details) Details 42 false false R43.htm 40305 - Disclosure - Investments - Schedule of Investments (Details) Sheet http://www.monroebdc.com/role/DisclosureInvestmentsScheduleOfInvestmentsDetails Investments - Schedule of Investments (Details) Details 43 false false R44.htm 40306 - Disclosure - Investments - SLF Balance Sheet (Details) Sheet http://www.monroebdc.com/role/DisclosureInvestmentsSlfBalanceSheetDetails Investments - SLF Balance Sheet (Details) Details 44 false false R45.htm 40307 - Disclosure - Investments - SLF, Net increase (decrease) in members' capital (Details) Sheet http://www.monroebdc.com/role/DisclosureInvestmentsSlfNetIncreaseDecreaseInMembersCapitalDetails Investments - SLF, Net increase (decrease) in members' capital (Details) Details 45 false false R46.htm 40401 - Disclosure - Fair Value Measurements - Fair value measurements of investments and foreign currency forward contracts, by major class according to the fair value hierarchy (Details) Sheet http://www.monroebdc.com/role/DisclosureFairValueMeasurementsFairValueMeasurementsOfInvestmentsAndForeignCurrencyForwardContractsByMajorClassAccordingToFairValueHierarchyDetails Fair Value Measurements - Fair value measurements of investments and foreign currency forward contracts, by major class according to the fair value hierarchy (Details) Details 46 false false R47.htm 40402 - Disclosure - Fair Value Measurements - Contractual interest rates (Details) Sheet http://www.monroebdc.com/role/DisclosureFairValueMeasurementsContractualInterestRatesDetails Fair Value Measurements - Contractual interest rates (Details) Details 47 false false R48.htm 40403 - Disclosure - Fair Value Measurements - Reconciliation of the beginning and ending balances for investments at fair value that use Level 3 inputs (Details) Sheet http://www.monroebdc.com/role/DisclosureFairValueMeasurementsReconciliationOfBeginningAndEndingBalancesForInvestmentsAtFairValueThatUseLevel3InputsDetails Fair Value Measurements - Reconciliation of the beginning and ending balances for investments at fair value that use Level 3 inputs (Details) Details 48 false false R49.htm 40404 - Disclosure - Fair Value Measurements - Valuation techniques and significant unobservable inputs used in recurring Level 3 fair value measurements of assets and liabilities (Details) Sheet http://www.monroebdc.com/role/DisclosureFairValueMeasurementsValuationTechniquesAndSignificantUnobservableInputsUsedInRecurringLevel3FairValueMeasurementsOfAssetsAndLiabilitiesDetails Fair Value Measurements - Valuation techniques and significant unobservable inputs used in recurring Level 3 fair value measurements of assets and liabilities (Details) Details 49 false false R50.htm 40501 - Disclosure - Transactions with Affiliated Companies - Fair Value Roll Forward (Details) Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithAffiliatedCompaniesFairValueRollForwardDetails Transactions with Affiliated Companies - Fair Value Roll Forward (Details) Details 50 false false R51.htm 40502 - Disclosure - Transactions with Affiliated Companies - Income Information (Details) Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithAffiliatedCompaniesIncomeInformationDetails Transactions with Affiliated Companies - Income Information (Details) Details 51 false false R52.htm 40601 - Disclosure - Transactions with Related Parties (Details) Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithRelatedPartiesDetails Transactions with Related Parties (Details) Details http://www.monroebdc.com/role/DisclosureTransactionsWithRelatedPartiesTables 52 false false R53.htm 40602 - Disclosure - Transactions with Related Parties - Composition of the Company's incentive fees (Details) Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithRelatedPartiesCompositionOfCompanySIncentiveFeesDetails Transactions with Related Parties - Composition of the Company's incentive fees (Details) Details 53 false false R54.htm 40603 - Disclosure - Transactions with Related Parties - Administrative agreement (Details) Sheet http://www.monroebdc.com/role/DisclosureTransactionsWithRelatedPartiesAdministrativeAgreementDetails Transactions with Related Parties - Administrative agreement (Details) Details 54 false false R55.htm 40701 - Disclosure - Borrowings - Company's outstanding debt (Details) Sheet http://www.monroebdc.com/role/DisclosureBorrowingsCompanySOutstandingDebtDetails Borrowings - Company's outstanding debt (Details) Details 55 false false R56.htm 40702 - Disclosure - Borrowings - Revolving Credit Facility (Details) Sheet http://www.monroebdc.com/role/DisclosureBorrowingsRevolvingCreditFacilityDetails Borrowings - Revolving Credit Facility (Details) Details 56 false false R57.htm 40703 - Disclosure - Borrowings - Term Loan (Details) Sheet http://www.monroebdc.com/role/DisclosureBorrowingsTermLoanDetails Borrowings - Term Loan (Details) Details 57 false false R58.htm 40704 - Disclosure - Borrowings - Asset - Backed Securitization (Details) Sheet http://www.monroebdc.com/role/DisclosureBorrowingsAssetBackedSecuritizationDetails Borrowings - Asset - Backed Securitization (Details) Details 58 false false R59.htm 40705 - Disclosure - Borrowings - Components of the Company's interest expense and other debt financing expenses, average debt outstanding balances and average stated interest rates (Details) Sheet http://www.monroebdc.com/role/DisclosureBorrowingsComponentsOfCompanySInterestExpenseAndOtherDebtFinancingExpensesAverageDebtOutstandingBalancesAndAverageStatedInterestRatesDetails Borrowings - Components of the Company's interest expense and other debt financing expenses, average debt outstanding balances and average stated interest rates (Details) Details 59 false false R60.htm 40706 - Disclosure - Borrowings (Details) Sheet http://www.monroebdc.com/role/DisclosureBorrowingsDetails Borrowings (Details) Details http://www.monroebdc.com/role/DisclosureBorrowingsTables 60 false false R61.htm 40801 - Disclosure - Derivative Instruments (Details) Sheet http://www.monroebdc.com/role/DisclosureDerivativeInstrumentsDetails Derivative Instruments (Details) Details http://www.monroebdc.com/role/DisclosureDerivativeInstrumentsTables 61 false false R62.htm 40901 - Disclosure - Distributions (Details) Sheet http://www.monroebdc.com/role/DisclosureDistributionsDetails Distributions (Details) Details http://www.monroebdc.com/role/DisclosureDistributionsTables 62 false false R63.htm 41001 - Disclosure - Stock Issuances and Share Repurchase Program - Stock Issuances (Details) Sheet http://www.monroebdc.com/role/DisclosureStockIssuancesAndShareRepurchaseProgramStockIssuancesDetails Stock Issuances and Share Repurchase Program - Stock Issuances (Details) Details 63 false false R64.htm 41002 - Disclosure - Stock Issuances and Share Repurchase Program - Share Repurchase Program (Details) Sheet http://www.monroebdc.com/role/DisclosureStockIssuancesAndShareRepurchaseProgramShareRepurchaseProgramDetails Stock Issuances and Share Repurchase Program - Share Repurchase Program (Details) Details 64 false false R65.htm 41101 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.monroebdc.com/role/DisclosureCommitmentsAndContingenciesDetails Commitments and Contingencies (Details) Details http://www.monroebdc.com/role/DisclosureCommitmentsAndContingencies 65 false false R66.htm 41201 - Disclosure - Financial Highlights - Schedule of financial highlights (Details) Sheet http://www.monroebdc.com/role/DisclosureFinancialHighlightsScheduleOfFinancialHighlightsDetails Financial Highlights - Schedule of financial highlights (Details) Details 66 false false R67.htm 41202 - Disclosure - Financial Highlights - Schedule of supplemental ratios (Details) Sheet http://www.monroebdc.com/role/DisclosureFinancialHighlightsScheduleOfSupplementalRatiosDetails Financial Highlights - Schedule of supplemental ratios (Details) Details 67 false false R68.htm 41301 - Disclosure - Subsequent Events (Details) Sheet http://www.monroebdc.com/role/DisclosureSubsequentEventsDetails Subsequent Events (Details) Details http://www.monroebdc.com/role/DisclosureSubsequentEventsTables 68 false false All Reports Book All Reports [dq-0542-Deprecated-Concept] Concept LondonInterbankOfferedRateLIBORMember in us-gaap/2022 used in 197 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. mcip-20230331x10q.htm 9, 58 [dq-0542-Deprecated-Concept] Concept DueToRelatedPartiesCurrentAndNoncurrent in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. mcip-20230331x10q.htm 57 [dq-0542-Deprecated-Concept] Concept AccountsPayableRelatedPartiesCurrentAndNoncurrent in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. mcip-20230331x10q.htm 57 [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 2582 fact(s) appearing in ix:hidden were eligible for transformation: dei:SecurityExchangeName, mcip:DividendReinvestmentPlanMinimumTermPriorToRecordDateFixedByBoard, mcip:NetInvestmentIncomePerShareDiluted, us-gaap-supplement:InvestmentNonIncomeProducing, us-gaap-supplement:InvestmentRestrictionStatus, us-gaap-supplement:InvestmentSignificantUnobservableInput, us-gaap:EarningsPerShareDiluted, us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding - mcip-20230331x10q.htm 9 [ix-0514-Hidden-Fact-Not-Referenced] WARN: 3875 fact(s) appearing in ix:hidden were not referenced by any -sec-ix-hidden style property: us-gaap-supplement:InvestmentIndustrySectorExtensibleEnumeration, us-gaap-supplement:InvestmentIssuerAffiliationExtensibleEnumeration, us-gaap-supplement:InvestmentIssuerGeographicRegionExtensibleEnumeration, us-gaap-supplement:InvestmentIssuerNameExtensibleEnumeration, us-gaap-supplement:InvestmentTypeExtensibleEnumeration, us-gaap-supplement:InvestmentVariableInterestRateTypeExtensibleEnumeration, us-gaap:CommitmentsAndContingencies, us-gaap:EmbeddedDerivativeAssetTypeExtensibleList - mcip-20230331x10q.htm 9 mcip-20230331x10q.htm mcip-20230331.xsd mcip-20230331_cal.xml mcip-20230331_def.xml mcip-20230331_lab.xml mcip-20230331_pre.xml mcip-20230331xex31d1.htm mcip-20230331xex31d2.htm mcip-20230331xex32d1.htm http://fasb.org/us-gaap-sup/2022q3 http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true