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Note 10 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Discount Rate	15.00%	15.00%
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 0	$ 0

X

- Definition

The percentage rate used to present value future cash flow projections.

+ References

No definition available.

+ Details

Name:	nrp_DiscountRate
Namespace Prefix:	nrp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B

+ Details

Name:	us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant