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Business Segments | 12 Months Ended
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Dec. 31, 2023
Segment Reporting [Abstract] |
Business Segments | Business Segments The Company’s operating segments are: (i) Coal Mining, (ii) NAMining and (iii) Minerals Management. The Company determines its reportable segments by first identifying its operating segments, and then by assessing whether any components of these segments constitute a business for which discrete financial information is available and where segment management regularly reviews the operating results of that component. The Company’s Chief Operating Decision Maker utilizes operating profit to evaluate segment performance and allocate resources. All financial statement line items below operating profit (other income including interest expense and interest income, the provision for income taxes and net income) are presented and discussed within this Form 10-K on a consolidated basis. See Note 1 for additional discussion of the Company's reportable segments. All current operations reside in the U.S. The accounting policies of the reportable segments are described in Note 2 and Note 18. In 2023 and 2022, two customers individually accounted for more than 10% of consolidated revenue. The following represents the revenue attributable to each of these entities as a percentage of consolidated revenue for those years:
|  |  | Percentage of Consolidated Revenue
| Segment |  | 2023 |  | 2022
| Coal Mining customer |  | 40 | % |  | 39 | %
| NAMining customer |  | 22 | % |  | 17 | %
The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31:
| 2023 |  | 2022 |  |
Revenues |  |  |  |  |
Coal Mining | $ | 85,415 |  |  | $ | 95,204 |  |  |
NAMining | 90,532 |  |  | 85,664 |  |  |
Minerals Management | 32,985 |  |  | 60,242 |  |  |
Unallocated Items | 8,459 |  |  | 2,952 |  |  |
Eliminations | (2,597) |  |  | (2,343) |  |  |
Total | $ | 214,794 |  |  | $ | 241,719 |  |  |
Operating (loss) profit |  |  |  |  |
Coal Mining | $ | (71,342) |  |  | $ | 38,309 |  |  |
NAMining | 3,348 |  |  | 2,202 |  |  |
Minerals Management | 19,418 |  |  | 52,214 |  |  |
Unallocated Items | (21,461) |  |  | (23,233) |  |  |
Eliminations | (100) |  |  | 494 |  |  |
Total | $ | (70,137) |  |  | $ | 69,986 |  |  |
Expenditures for property, plant and equipment and acquisition of mineral interests |  |  |  |  |
Coal Mining | $ | 6,609 |  |  | $ | 14,853 |  |  |
NAMining | 36,073 |  |  | 13,203 |  |  |
Minerals Management | 38,881 |  |  | 13,388 |  |  |
Unallocated Items | 559 |  |  | 13,003 |  |  |
Total | $ | 82,122 |  |  | $ | 54,447 |  |  |
Depreciation, depletion and amortization |  |  |  |  |
Coal Mining | $ | 17,569 |  |  | $ | 17,074 |  |  |
NAMining | 8,172 |  |  | 6,457 |  |  |
Minerals Management | 3,067 |  |  | 3,026 |  |  |
Unallocated Items | 579 |  |  | 259 |  |  |
Total | $ | 29,387 |  |  | $ | 26,816 |  |  |
Asset information by segment is not discretely maintained for internal reporting or used in evaluating performance.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//280/tableOfContent Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-26 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-34 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 + Details
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