XML 143 R69.htm IDEA: XBRL DOCUMENT
v3.24.3

Commitments and Contingencies (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Unfunded commitments on revolving credit facilities |  |
Other Commitments [Line Items] |  |
Unfunded commitments principal amount | $ 146,530 | $ 112,803
Unfunded commitments on bridge facilities |  |
Other Commitments [Line Items] |  |
Unfunded commitments principal amount | 0 | 0
Unfunded commitments on delayed draws or other future funding commitments |  |
Other Commitments [Line Items] |  |
Unfunded commitments principal amount | 130,848 | 43,948
Financing commitment letter to purchase investments |  |
Other Commitments [Line Items] |  |
Other commitments | $ 87,649 | $ 11,105

X
- Definition Amount of financial support committed by investment company to investee that is contractually required but not provided. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-16 + Details
Name: | us-gaap_InvestmentCompanyFinancialCommitmentToInvesteeFutureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialSupportToNonconsolidatedLegalEntityAxis=nmfc_UnfundedDebtSecuritiesRevolvingCreditFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialSupportToNonconsolidatedLegalEntityAxis=nmfc_UnfundedDebtSecuritiesBridgeFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialSupportToNonconsolidatedLegalEntityAxis=nmfc_UnfundedDebtSecuritiesDelayedDrawsOrOtherFutureFundingCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=nmfc_FinancingCommitmentLetterToPurchaseInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |