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Note 10 - Fair Value Measurements (Details Textual)	Mar. 31, 2025	Dec. 31, 2024
Discount Rate	15.00%	15.00%

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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