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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

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- 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

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- 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