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Note 11 - Related Party Transactions - General Partner Affiliates (Details) - QMC and WPPLP and QID [Member] - Affiliated Entity [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating Costs and Expenses	$ 1,793	$ 1,766
General and administrative expenses	$ 1,569	$ 1,303

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: