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Disclosure - Borrowings - Convertible Notes, Narrative (Details) Notes http://www.newmountainfinance.com/role/BorrowingsConvertibleNotesNarrativeDetails Borrowings - Convertible Notes, Narrative (Details) Details 55 false false R56.htm 9954733 - Disclosure - Borrowings - Convertible Notes, Key Terms (Details) Notes http://www.newmountainfinance.com/role/BorrowingsConvertibleNotesKeyTermsDetails Borrowings - Convertible Notes, Key Terms (Details) Details 56 false false R57.htm 9954734 - Disclosure - Borrowings - Convertible Notes, Other Information (Details) Notes http://www.newmountainfinance.com/role/BorrowingsConvertibleNotesOtherInformationDetails Borrowings - Convertible Notes, Other Information (Details) Details 57 false false R58.htm 9954735 - Disclosure - Borrowings - Unsecured Notes (Details) Notes http://www.newmountainfinance.com/role/BorrowingsUnsecuredNotesDetails Borrowings - Unsecured Notes (Details) Details 58 false false R59.htm 9954736 - Disclosure - Borrowings - SBA-guaranteed Debentures, Narrative (Details) Sheet http://www.newmountainfinance.com/role/BorrowingsSBAguaranteedDebenturesNarrativeDetails Borrowings - 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Roll forward of Net Assets (Details) Details 63 false false R64.htm 9954741 - Disclosure - Net Assets - Narrative (Details) Sheet http://www.newmountainfinance.com/role/NetAssetsNarrativeDetails Net Assets - Narrative (Details) Details 64 false false R65.htm 9954742 - Disclosure - Earnings Per Share (Details) Sheet http://www.newmountainfinance.com/role/EarningsPerShareDetails Earnings Per Share (Details) Details http://www.newmountainfinance.com/role/EarningsPerShareTables 65 false false R66.htm 9954743 - Disclosure - Financial Highlights (Details) Sheet http://www.newmountainfinance.com/role/FinancialHighlightsDetails Financial Highlights (Details) Details http://www.newmountainfinance.com/role/FinancialHighlightsTables 66 false false R67.htm 9954744 - Disclosure - Subsequent Events (Details) Sheet http://www.newmountainfinance.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://www.newmountainfinance.com/role/SubsequentEvents 67 false false All Reports Book All Reports [dq-0542-Deprecated-Concept] Concept DueFromAffiliates in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. nmfc-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept DueToAffiliateCurrentAndNoncurrent in us-gaap/2022 used in 5 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. nmfc-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept LondonInterbankOfferedRateLIBORMember in us-gaap/2022 used in 7 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -4000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i08ffef001b464f69b6c7203e1466282f_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i92c2a6ca6f6044a3967c0ddff8f5caaa_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -6000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i38ed214baec14a18bbb7fdf15417963a_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -9000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i5a96a1825cd44da9bea60460e9a37dc1_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -9000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ie0675602b367453da025b230e827022e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -10000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i22164396b1114f438111eb7047315be6_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -18000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i8f27332aee5c4d389a6a36dddbeeaee2_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -6000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i2f81a45e6b274080bac33c52e206a8d5_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -15000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i3a98eef19a8e4726b90fd7c82296bc78_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -21000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i393a7ee6072d42a898b48f77a0d03e96_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -22000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i7ec263adbb264c0e9117865007740c27_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -22000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i2746638ddb26456c9a58e2fc6b6f4488_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -3000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i17f030d8d178417b8c49e3ccdacbe16a_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -2000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: icf9c047ba4d24c0889c3214d84e8e916_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -44000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: iddeecab5abd84d2e9bb3fee8913878cf_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -2000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ie5771117cbfa4f7c8464fe9edaacd27b_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -1000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i204df319b04845acabf279d85dea3736_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -7000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: id5dda3decd0a45f69a16a516de3b4052_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -8000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ie91ee78aa48d451081868c5054ef92c8_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -23000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i9854351eb7674392a4860d54321266cc_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -20000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i38b8c44f6ec842ca8ec81ff3667cfd87_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -24000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i4c08d265cbb64de9b5bfa0d932f5c5a0_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -14000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: id5c56ca0a2894efba6d246b7e42cba51_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i5d4d4ef9d2454c458922e5705f4b7f01_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ie5cd58b6e7824300976176cf3b1e38a4_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -12000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: icf4e184945214934b28949b8788ef36a_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -12000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i2b3ddc1a192048a4a77f069d24adb11a_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -23000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: id14818670045457fbdaa7a533177d3d0_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -36000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ia011d4406a904d9aa985cc1b7ab1aa1d_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -37000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ibc6e0e4be3e341baa9ecfa454ed930c7_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -37000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i5896ad5d75084f7c97e48772f54d130a_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i5dc5fea628d8434e83b972c04b40a588_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -4000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: if457c4d01398477bb1ce86a35252f513_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -4000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i8f62ab22ab8243c0be24ac8ac1e8dc5a_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -3000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i417e6678cf8d4be39a108a11926305c4_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -9000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i2530d397b8b540efacd734913bed84e7_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -16000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ica6d5aa078a3487d89e0e1c12696530e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -29000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i0ce2b5eaaa154c65857280ea91eaebb5_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -15000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ib780d2a5d9ad492d83f740a4faa16f3e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -15000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i814b5fa4812446dead8f0142617ca080_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -43000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ic9d66cfbbc9f43e899d8ef31acd55b3b_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -43000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i80cde2fcb1e9446ebe5898ac5d4373d1_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -9000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i5eb4591458be4f2a9884cee25bb0131e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -9000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i07e214aab100451da0f2cf02fe00ef0e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -27000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i94fb169cb6ea41eda0e637ef8d42334f_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -37000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i32ddc9ebeb7d49eb8e57a1c58f391cbf_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -83000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i1e50d4dd6cbc4d3c88ad177d1aa8b0fb_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -147000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i8570c12e3fe94d988c2adf29e57ffc09_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -36000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i7d69d668dfc14c44b81a0b856de34e63_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i871ca12e7bf44ec3ba939e42aa0d7f8a_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -42000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i633427ded3ac487690bce2babfa16e5f_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -47000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: idbeb8a183ad747089e1a0a68937c6621_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -7000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i896f8c24148643ffb6b91e7e91636104_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: iabdb1aca40664f7f8cfe44b006c7d033_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -12000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i10e962e9e1674a348e648546c3174e72_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -29000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ib7a9f64d3d8b43188f015aa0611d56c1_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -29000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i4b78255d7a264b0dab959442b36e6ddd_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -8000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ie1d974a245c6472396bacd7fd004c3df_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -8000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: id488a57abdab4269943398e6e9fb0bff_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -16000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i82487dd2518349ea95998389ae6eca33_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -16000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ibe8e962b0036424f974c61061361fc38_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -21000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i98daf37da6924022bea0a6dc888b479a_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -21000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: iaa3944d8ebb6401dab1767c23ae1246c_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -13000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i3d752ed24d16442ba3872b57f8382589_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -9000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i6ce301652cdd45b7aa4121e7759990c3_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -9000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i5dc90564edb14f34b61b9a1ca8d3d5c4_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -10000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i64cd017a7fe441b2ac831e1c5ea7d1e9_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -10000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i6e6ef8667ac14d2ab14c54a731989508_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -10000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i00ff90ecd0634d43bb9541b357657a6e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -57000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i93c6936a44b8465cbc661c1d776d3810_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -67000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i65975e1320114a3880e89a34ad714e85_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -13000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ib6bb8d3971bc46a7a01a339e18b9bceb_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -20000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i096d76cd37394aac82b36dc0c127d255_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -33000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i1db0a6934d544d9ea3906fb3eb99819e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -25000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: id83b2a3e24d84a9aaafc1c5c5c5edd5e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -25000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i3eb332811a9244539aac27f198a0bb23_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -24000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ie05db6bae4744ef6b84c12bda1a4d2ac_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -24000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i21fa7d8bfad045288947cb9baf74f1eb_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -2000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i375f52b858894becba26dd10c2b9ceb4_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -2000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i03d9adf30b40409fac1ab32f72a20877_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -989000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i0270117c7dd44fe192586235ad0778df_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -44000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: if8b580976e1347e9bc957562983df5f3_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -44000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i4dace55861ef42858235bdcf16eaee95_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i3a258071035f49b791e8ec1aff774add_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: ica4d3bf483fb4adfa3ecf10823ce947e_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -1038000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i42f0891c7922441b9c51bc4aea2e1ab0_I20230331, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -3000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i08a25ad3f60c4df6a2c48c3b2070efac_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -4000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i9c1fc49d84934dd681011a1ae72d3188_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i40edbb2e20a94afebdaedbe05b978fc3_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i74e5336771e2413885975253d0510931_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -9000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i4b23492fae8748a4a76bb407bad43201_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -12000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i1c59af644b18443e83cd9b65fc780ae7_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -13000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i88a0c65d9f0d49488da1d06c3ea71a01_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -17000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i35e5db90cb9343c4a8ee8d6066539e16_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -18000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: i70fedae22c2c4a9ea19c87204e874d69_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -3000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: if7b82e66031d4d73bfbe79c28e2e42f4_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:InvestmentOwnedAtCost has a value of -5000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:InvestmentOwnedAtCost fact are: Context: iaebb01762f0845f39c19f03137618f0a_I20221231, Unit: usd, Rule Element Id: 1442. nmfc-20230331.htm 4 There are more than 100 warnings or errors, only 100 will be displayed. nmfc-20230331.htm nmfc-033123xex102.htm nmfc-033123xex103.htm nmfc-033123xex311.htm nmfc-033123xex312.htm nmfc-033123xex321.htm nmfc-033123xex322.htm nmfc-20230331.xsd nmfc-20230331_cal.xml nmfc-20230331_def.xml nmfc-20230331_lab.xml nmfc-20230331_pre.xml nmfc-20230331_g1.jpg http://fasb.org/us-gaap-sup/2022q3 http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/cef/2022 http://xbrl.sec.gov/dei/2022 true true