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Note 3 - Warrants (Details Textual) - Warrants at 34.00 Strike Price [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2025	Dec. 31, 2024
Class of Warrant or Right, Repurchased and Retired (in shares)	1,219,665
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 34
Warrants and Rights Settled	$ 55.7
Partners' Capital Account, Units, Warrant Settlements (in shares)	198,767
Class of Warrant or Right, Outstanding (in shares)		0	0

X

- Definition

The number of warrants or rights repurchased and retired during the period.

+ References

No definition available.

+ Details

Name:	nrp_ClassOfWarrantOrRightRepurchasedAndRetired
Namespace Prefix:	nrp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Change in the number of units for each class of partners' capital accounts during the year due to warrant settlements. Partners include general, limited and preferred partners.

+ References

No definition available.

+ Details

Name:	nrp_PartnersCapitalAccountUnitsWarrantSettlements
Namespace Prefix:	nrp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The value of warrants and rights settled during the period.

+ References

No definition available.

+ Details

Name:	nrp_WarrantsAndRightsSettled
Namespace Prefix:	nrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=nrp_WarrantsAt3400StrikePriceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: