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Note 2 - Revenue From Contracts With Customers - Operating Lease Payments Receivable (Details) $ in Thousands	Mar. 31, 2025 USD ($)	[1]
Weighted average remaining years (Year)	7 years 1 month 6 days
Annual minimum payments	$ 56,453
Lease Term, 0 to 5 Years [Member]
Weighted average remaining years (Year)	2 years 2 months 12 days
Annual minimum payments	$ 13,244
Lease Term, 5 to 10 Years [Member]
Weighted average remaining years (Year)	5 years
Annual minimum payments	$ 16,900
Lease Term, Greater Than 10 Years [Member]
Weighted average remaining years (Year)	11 years
Annual minimum payments	$ 26,309
[1] Lease term does not include renewal periods.

X

- Definition

Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-12

+ Details

Name:	us-gaap_LessorOperatingLeasePaymentsToBeReceived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=nrp_LeaseTerm0To5YearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=nrp_LeaseTerm5To10YearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=nrp_LeaseTermGreaterThan10YearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: