XML 43 R17.htm IDEA: XBRL DOCUMENT
v3.25.3

Regulation | 9 Months Ended
--- | ---
Sep. 30, 2025
Investment Company [Abstract] |
Regulation | Regulation The Company has elected to be treated, and intends to comply with the requirements to continue to qualify annually, as a RIC under Subchapter M of the Code. In order to continue to qualify and be subject to tax treatment as a RIC, among other things, the Company is generally required to timely distribute to its stockholders at least 90.0% of its investment company taxable income, as defined by the Code, for each year. The Company, among other things, intends to make and will continue to make the requisite distributions to its stockholders, which will generally relieve the Company from U.S. federal, state, and local income taxes (excluding excise taxes which may be imposed under the Code). Additionally, as a BDC, the Company must not acquire any assets other than "qualifying assets" as defined in Section 55(a) of the 1940 Act unless, at the time the acquisition is made, at least 70.0% of its total assets are qualifying assets (with certain limited exceptions). In addition, the Company must offer to make available to all "eligible portfolio companies" (as defined in the 1940 Act) significant managerial assistance.

X
- Definition Regulatory Capital Requirements For Investment Companies + References No definition available. + Details
Name: | nmfc_RegulatoryCapitalRequirementsForInvestmentCompaniesTextBlock
Namespace Prefix: | nmfc_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentCompanyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration