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Agreements - Management Fees and Incentive Fees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Management fee	$ 11,638	$ 11,553
Less: management fee waiver	(1,063)	(1,092)
Total management fee	10,575	10,461
Incentive fee	9,597	7,477
Incentive fee payable	9,597		$ 6,296
Incentive fee, excluding accrued capital gains incentive fees
Related Party Transaction [Line Items]
Incentive fee	9,597	7,477
Accrued capital gains incentive fees
Related Party Transaction [Line Items]
Incentive fee	0	0
Incentive fee payable	$ 0	$ 0

X

- Definition

Investment Company, Contractual Fee Waived, Management Fee

+ References

No definition available.

+ Details

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Namespace Prefix:	nmfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Investment Company, Management Fee Expense, After Reduction Of Fee Waiver

+ References

No definition available.

+ Details

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Namespace Prefix:	nmfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap-supplement_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of expense for incentive rights held by the managing member or general partner, of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nmfc_InvestmentManagementAgreementRealizedCapitalGainsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: