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Note 3 - Revenues From Contracts With Customers (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | For the Year Ended December 31, |
(In thousands) |  | 2024 |  |  | 2023 |  |  | 2022 |
Coal royalty revenues |  | $ | 159,033 |  |  | $ | 218,011 |  |  | $ | 226,956 |
Production lease minimum revenues |  |  | 4,365 |  |  |  | 3,322 |  |  |  | 5,854 |
Minimum lease straight-line revenues |  |  | 16,530 |  |  |  | 19,389 |  |  |  | 18,792 |
Carbon neutral revenues (1) |  |  | 15,703 |  |  |  | 2,969 |  |  |  | 8,600 |
Property tax revenues |  |  | 7,100 |  |  |  | 6,219 |  |  |  | 5,878 |
Wheelage revenues |  |  | 9,324 |  |  |  | 12,191 |  |  |  | 13,961 |
Coal overriding royalty revenues |  |  | 2,358 |  |  |  | 2,175 |  |  |  | 3,434 |
Lease amendment revenues |  |  | 3,724 |  |  |  | 3,070 |  |  |  | 3,201 |
Aggregates royalty revenues |  |  | 2,904 |  |  |  | 2,876 |  |  |  | 3,299 |
Oil and gas royalty revenues |  |  | 8,566 |  |  |  | 7,387 |  |  |  | 16,161 |
Other revenues |  |  | 2,744 |  |  |  | 1,124 |  |  |  | 877 |
Royalty and other mineral rights revenues |  | $ | 232,351 |  |  | $ | 278,733 |  |  | $ | 307,013 |
Transportation and processing services revenues |  |  | 8,597 |  |  |  | 12,411 |  |  |  | 17,876 |
Total Mineral Rights segment revenues from contracts with customers |  | $ | 240,948 |  |  | $ | 291,144 |  |  | $ | 324,889 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | December 31, |
(In thousands) |  | 2024 |  |  | 2023 |
Receivables |  |  |  |  |  |  |  |
Accounts receivable, net |  | $ | 27,358 |  |  | $ | 37,206 |
Other current assets, net (1) |  |  | — |  |  |  | 429 |
Other long-term assets, net (2) |  |  | 2,352 |  |  |  | — |
Contract liabilities |  |  |  |  |  |  |  |
Accounts payable (3) |  | $ | 125 |  |  | $ | — |
Current portion of deferred revenue |  |  | 4,341 |  |  |  | 4,599 |
Deferred revenue |  |  | 55,814 |  |  |  | 38,356 |
|  | For the Year Ended December 31, |
(In thousands) |  | 2024 |  |  | 2023 |  |  | 2022 |
Balance at beginning of period (current and non-current) |  | $ | 42,955 |  |  | $ | 46,437 |  |  | $ | 61,862 |
Increase due to minimums and lease amendment fees |  |  | 32,960 |  |  |  | 17,526 |  |  |  | 19,073 |
Recognition of previously deferred revenue |  |  | (15,760 | ) |  |  | (21,008 | ) |  |  | (34,498 | )
Balance at end of period (current and non-current) |  | $ | 60,155 |  |  | $ | 42,955 |  |  | $ | 46,437 |
Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] |
Lease Term (1) |  | Weighted Average Remaining Years |  |  | Annual Minimum Payments |
0 - 5 years |  |  | 2.3 |  |  | $ | 13,478 |
5 - 10 years |  |  | 5.4 |  |  |  | 17,477 |
10+ years |  |  | 11.2 |  |  |  | 26,309 |
Total |  |  | 7.3 |  |  | $ | 57,264 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of maturity of undiscounted cash flows to be received by lessor on annual basis for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-12 + Details
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