Note 9 - Mineral Rights, Net (Details Textual) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Depreciation, Depletion and Amortization, Total		$ 22,519	$ 19,075	$ 9,198
Asset Impairment Charges, Total		$ 4,457	$ 5,102	135,885
Discount Rate		15.00%	15.00%
Coal Mineral Rights [Member]
Asset Impairment Charges, Total	[1]	$ 4,365	$ 5,015	114,302
Coal Mineral Rights [Member] | Other [Member]
Asset Impairment Charges, Total		2,600
Property, Plant and Equipment, Net, Total		4,300
Property, Plant, and Equipment, Fair Value Disclosure		1,700
Aggregates Properties [Member]
Asset Impairment Charges, Total	[2]	92	87	21,583
Mineral Rights Segment [Member]
Depreciation, Depletion and Amortization, Total		$ 20,900	$ 17,600	$ 8,800

[1] The Partnership recorded $4.4 million of impairment expense during the year ended December 31, 2022, primarily related to assets whose undiscounted future net cash flows were less than their net book values. Of this amount, $2.6 million of impairment expense related to an asset with $4.3 million of net book value, resulting in a fair value of $1.7 million at December 31, 2022. The fair value of the impaired asset at December 31, 2022 was calculated using a discount rate of 15%. The Partnership recorded $5.0 million of impairment expense during the year ended December 31, 2021 primarily related to the full impairment of an asset resulting from a lease termination. The partnership recorded $114.3 million of impairment expense to impair certain assets during the year ended December 31, 2020 primarily related to weakened coal markets that resulted in termination of certain coal leases and changes to lessee mine plans resulting in permanent moves off certain of our coal properties. NRP compared the net book value of its coal properties to estimated undiscounted future net cash flows. If the net book value exceeded the undiscounted future cash flows, the Partnership recorded an impairment for the excess of the net book value over fair value. A discounted cash flow model was used to estimate the level 3 fair value. Significant inputs used to determine fair value include estimates of future cash flows from coal sales and minimum payments, discount rate and useful economic life. Estimated cash flows are the product of a process that began with current realized pricing as of the measurement date and included an adjustment for risk related to the future realization of cash flows.

[2] The Partnership recorded $0.1 million of aggregates royalty property impairments during the year ended December 31, 2022. The Partnership recorded $21.6 million of aggregates royalty property impairments during the year ended December 31, 2021 primarily related to decreased oil and gas drilling activity which negatively impacted the outlook for NRP's frac sand properties. The Partnership recorded $0.1 million of aggregates royalty property impairments during the year ended December 31, 2020. NRP compared the net book value of its aggregates and timber properties to estimated undiscounted future net cash flows. If the net book value exceeded the undiscounted cash flows, the Partnership recorded an impairment for the excess of the net book value over fair value. A discounted cash flow model was used to estimate fair value. Significant inputs used to determine fair value include estimates of future cash flows from aggregates sales and minimum payments, discount rate and useful economic life. Estimated cash flows are the product of a process that began with current realized pricing as of the measurement date and included an adjustment for risk related to the future realization of cash flows.