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Note 4 - Common and Preferred Unit Distributions (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Allocated to Preferred Unit Holders	$ 0	$ (2,150)
Common Unitholders And General Partner [Member]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Allocated to Preferred Unit Holders		$ 2,200
Partner, General [Member]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest	2.00%

X

- Definition

Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest, Allocated to Preferred Unit Holders

+ References

No definition available.

+ Details

Name:	nrp_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestAllocatedToPreferredUnitHolders
Namespace Prefix:	nrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482987/272-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nrp_CommonUnitholdersAndGeneralPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=nrp_PartnerGeneralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: