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Note 2 - Revenues From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue from contract with customers $ 68,533 $ 81,379 $ 205,811 $ 231,795
Mineral Rights Segment [Member] | Operating Segments [Member]        
Revenues 73,112 87,348 217,258 247,172
Coal Royalty Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 55,544 52,381 161,527 170,775
Production Lease Minimum Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 850 1,885 2,025 3,542
Minimum Lease Straight-line Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 4,464 4,778 13,414 14,235
Carbon Neutral Initiatives [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 681 8,600 2,914 8,600
Property Tax Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 1,770 1,360 4,710 4,527
Wheelage Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 2,385 2,977 9,538 11,073
Coal Overriding Royalty Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 827 1,367 1,165 2,307
Lease Amendment Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 623 759 2,322 2,450
Aggregates Royalty Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 736 884 2,175 2,691
Oil and Gas Royalty Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 324 6,170 5,126 10,890
Other Revenues [Member] | Mineral Rights Segment [Member]        
Revenue from contract with customers 329 218 895 705
Transportation and Processing Services [Member] | Mineral Rights Segment [Member]        
Revenues [1] $ 4,579 $ 5,969 $ 11,447 $ 15,377
[1] Transportation and processing services revenues from contracts with customers as defined under ASC 606 was $3.9 million and $4.9 million for the three months ended September 30, 2023 and 2022, respectively and $9.5 million and $12.9 million for the nine months ended September 30, 2023 and 2022, respectively. The remaining transportation and processing services revenues of $0.6 million and $1.1 million for the three months ended September 30, 2023 and 2022, respectively, and $1.9 million and $2.5 million for the nine months ended September 30, 2023 and 2022, respectively, related to other NRP-owned infrastructure leased to and operated by third-party operators accounted for under other guidance. See Note 15. Financing Transaction for more information.