XML 80 R67.htm IDEA: XBRL DOCUMENT v3.23.1

Subsequent Events (Details) - $ / shares		3 Months Ended
	Apr. 25, 2023	Mar. 31, 2023	Mar. 31, 2022
Subsequent Event [Line Items]
Distributions declared per share (in dollars per share)		$ 0.32	$ 0.30
Subsequent Event | Regular distribution
Subsequent Event [Line Items]
Distributions declared per share (in dollars per share)	$ 0.32
Subsequent Event | Supplemental distribution
Subsequent Event [Line Items]
Distributions declared per share (in dollars per share)	$ 0.03

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=nmfc_RegularDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=nmfc_SupplementalDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: