XML 159 R62.htm IDEA: XBRL DOCUMENT v3.25.0.1

Note 9 - Mineral Rights, Net - Composition of Mineral Rights (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Mineral Properties, carrying value	$ 695,113	$ 695,408
Mineral Properties, accumulated depletion	(315,475)	(300,925)
Mineral Properties, net book value	379,638	394,483
Coal Properties [Member]
Mineral Properties, carrying value	660,961	661,256
Mineral Properties, accumulated depletion	(299,404)	(285,470)
Mineral Properties, net book value	361,557	375,786
Aggregates Properties [Member]
Mineral Properties, carrying value	8,655	8,655
Mineral Properties, accumulated depletion	(4,065)	(3,761)
Mineral Properties, net book value	4,590	4,894
Oil and Gas Royalty Properties [Member]
Mineral Properties, carrying value	12,354	12,354
Mineral Properties, accumulated depletion	(10,394)	(10,082)
Mineral Properties, net book value	1,960	2,272
Other [Member]
Mineral Properties, carrying value	13,143	13,143
Mineral Properties, accumulated depletion	(1,612)	(1,612)
Mineral Properties, net book value	$ 11,531	$ 11,531

X

- Definition

The accumulated decrease in the carrying value of the mineral properties as a result of mine or mineral production.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount at the balance sheet date of mineral properties, gross of adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

Name:	us-gaap_MineralPropertiesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Mineral properties, net of adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

Name:	us-gaap_MineralPropertiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=nrp_CoalPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=nrp_AggregatesPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=nrp_OilAndGasRoyaltyPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=nrp_OtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: