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Note 2 - Revenues From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue from contract with customers	$ 51,260	$ 65,574
Mineral Rights Segment [Member] | Operating Segments [Member]
Revenue from contract with customers	55,145	68,410
Coal Royalty Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	35,498	46,818
Production Lease Minimum Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	2,725	924
Minimum Lease Straight-line Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	4,050	4,171
Oil and Gas Royalty Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	2,444	3,640
Carbon Neutral Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	595	2,161
Property Tax Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	1,637	1,892
Wheelage Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	1,738	2,672
Coal Overriding Royalty Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	880	1,169
Lease Amendment Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	655	702
Aggregates Royalty Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	853	772
Other Revenues [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	185	653
Transportation and Processing Services [Member] | Mineral Rights Segment [Member]
Revenue from contract with customers	$ 3,885	$ 2,836

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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