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Business Segments (Tables) | 3 Months Ended
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Mar. 31, 2024
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information | The following table presents Revenues, Cost of sales, Earnings of unconsolidated operations, Operating expenses, Operating profit (loss), Expenditures for property, plant and equipment and acquisition of mineral interests and Depreciation, depletion and amortization expense:
| THREE MONTHS ENDED |  |
| MARCH 31 |  |
| 2024 |  | 2023 |  |  |  |
Revenues |  |  |  |  |  |  |
Coal Mining | $ | 15,545 |  |  | $ | 20,653 |  |  |  |  |
NAMining | 24,483 |  |  | 20,633 |  |  |  |  |
Minerals Management | 10,401 |  |  | 8,285 |  |  |  |  |
Unallocated Items | 3,262 |  |  | 1,191 |  |  |  |  |
Eliminations | (402) |  |  | (621) |  |  |  |  |
Total | $ | 53,289 |  |  | $ | 50,141 |  |  |  |  |
Cost of sales |  |  |  |  |  |  |
Coal Mining | $ | 20,943 |  |  | $ | 25,878 |  |  |  |  |
NAMining | 21,671 |  |  | 19,241 |  |  |  |  |
Minerals Management | 1,364 |  |  | 1,052 |  |  |  |  |
Unallocated Items | 2,712 |  |  | 1,214 |  |  |  |  |
Eliminations | (419) |  |  | (601) |  |  |  |  |
Total | $ | 46,271 |  |  | $ | 46,784 |  |  |  |  |
Earnings of unconsolidated operations |  |  |  |  |  |  |
Coal Mining | $ | 12,007 |  |  | $ | 12,466 |  |  |  |  |
NAMining | 1,365 |  |  | 1,358 |  |  |  |  |
Minerals Management | (65) |  |  | — |  |  |  |  |
Total | $ | 13,307 |  |  | $ | 13,824 |  |  |  |  |
Operating expenses* |  |  |  |  |  |  |
Coal Mining | $ | 7,026 |  |  | $ | 6,928 |  |  |  |  |
NAMining | 1,822 |  |  | 1,920 |  |  |  |  |
Minerals Management | 1,042 |  |  | 1,189 |  |  |  |  |
Unallocated Items | 5,678 |  |  | 5,330 |  |  |  |  |
Total | $ | 15,568 |  |  | $ | 15,367 |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |
Coal Mining | $ | (417) |  |  | $ | 313 |  |  |  |  |
NAMining | 2,355 |  |  | 830 |  |  |  |  |
Minerals Management | 7,930 |  |  | 6,044 |  |  |  |  |
Unallocated Items | (5,128) |  |  | (5,353) |  |  |  |  |
Eliminations | 17 |  |  | (20) |  |  |  |  |
Total | $ | 4,757 |  |  | $ | 1,814 |  |  |  |  |
*Operating expenses consist of Selling, general and administrative expenses, Amortization of intangible assets and (Gain) loss on sale of assets.
| THREE MONTHS ENDED |  |
| MARCH 31 |  |
| 2024 |  | 2023 |  |  |  |
Expenditures for property, plant and equipment and acquisition of mineral interests |  |  |  |  |  |  |
Coal Mining | $ | 1,794 |  |  | $ | 2,686 |  |  |  |  |
NAMining | 5,818 |  |  | 4,423 |  |  |  |  |
Minerals Management | 136 |  |  | 344 |  |  |  |  |
Unallocated Items | 6,735 |  |  | 426 |  |  |  |  |
Total | $ | 14,483 |  |  | $ | 7,879 |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |
Coal Mining | $ | 2,214 |  |  | $ | 4,240 |  |  |  |  |
NAMining | 2,256 |  |  | 1,886 |  |  |  |  |
Minerals Management | 993 |  |  | 811 |  |  |  |  |
Unallocated Items | 229 |  |  | 82 |  |  |  |  |
Total | $ | 5,692 |  |  | $ | 7,019 |  |  |  |  |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 + Details
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