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Note 13 - Related Party Transactions - General Partner Affiliates (Details) - QMC and WPPLP and QID [Member] - Affiliated Entity [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating Costs and Expenses | $ 7,106 | $ 6,747 | $ 6,694
General and administrative expenses | $ 5,420 | $ 5,408 | $ 4,864

X
- Definition The amount of general and administrative expenses incurred during the reporting period, including affiliates. + References No definition available. + Details
Name: | nrp_GeneralAndAdministrativeExpenseIncludingAffiliates
Namespace Prefix: | nrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. + References No definition available. + Details
Name: | us-gaap_OperatingCostsAndExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=nrp_QMCAndWPPLPAndQIDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |