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Note 4 - Common and Preferred Unit Distributions - Distributions Made to Partners (Details) - USD ($)
$ / shares in Units, $ in Thousands

1 Months Ended

3 Months Ended

Mar. 31, 2025

Feb. 28, 2025

Mar. 31, 2024

Feb. 29, 2024

Mar. 31, 2025

Mar. 31, 2024

Distributions, common units

$ 26,276

$ 42,186

Preferred Partner [Member] | Preferred Stock [Member]

Distribution per unit, common units (in dollars per share)

$ 0

$ 30

Distribution, preferred stock

$ 0

$ 2,150

Preferred Partner [Member] | Preferred Stock [Member] | March 2025 Special Distribution [Member]

Distribution per unit, common units (in dollars per share)

^[1]

$ 0

Distribution, preferred stock

^[1]

$ 0

Preferred Partner [Member] | Preferred Stock [Member] | March 2024 Special Distribution [Member]

Distribution per unit, common units (in dollars per share)

^[2]

$ 0

Distribution, preferred stock

^[2]

$ 0

Common Unitholders, General Partner [Member]

Distribution per unit, common units (in dollars per share)

$ 0.75

$ 0.75

Distributions, common units

^[3]

$ 10,055

$ 9,918

Common Unitholders, General Partner [Member] | March 2025 Special Distribution [Member]

Distribution per unit, common units (in dollars per share)

^[1]

$ 1.21

Distributions, common units

^[1],[3]

$ 16,221

Common Unitholders, General Partner [Member] | March 2024 Special Distribution [Member]

Distribution per unit, common units (in dollars per share)

^[2]

$ 2.44

Distributions, common units

^[2],[3]

$ 32,268

[1]	Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2024.
[2]	Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2023.
[3]	Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest.

X

- Definition

Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

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

X

- Definition

Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477787/942-405-45-2

+ Details

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

X

- Definition

Total distributions to each class of partners (i.e., general, limited and preferred partners).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_PreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis=nrp_March2025SpecialDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis=nrp_March2024SpecialDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PartnerCapitalComponentsAxis=nrp_CommonUnitholdersGeneralPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: