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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2019
Segment Reporting [Abstract] |
Schedule of Revenue by Major Customers by Reporting Segments | The following represents the revenue attributable to each of these entities as a percentage of consolidated revenue for those years:
|  |  | Percentage of Consolidated Revenue
Customer | Segment |  | 2019 |  | 2018 |
Choctaw Generation Limited Partnership, LLLP | Coal Mining |  | 48 | % |  | 60 | % |
CEMEX | NAMining |  | 21 | % |  | 20 | % |
Ascent Resources | Minerals Management |  | 12 | % |  | n/a |  |
Segment Reporting Information | The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31:
| 2019 |  | 2018
Revenues |  |  |
Coal Mining | $ | 68,701 |  |  | $ | 81,549 |
NAMining | 42,823 |  |  | 36,950 |
Minerals Management | 30,119 |  |  | 17,352 |
Unallocated Items | 790 |  |  | 665 |
Eliminations | (1,443 | ) |  | (1,141 | )
Total | $ | 140,990 |  |  | $ | 135,375 |
Operating profit (loss) |  |  |
Coal Mining | $ | 23,268 |  |  | $ | 38,270 |
NAMining | (696 | ) |  | 1,918 |
Minerals Management | 25,721 |  |  | 14,331 |
Unallocated Items | (9,729 | ) |  | (10,473 | )
Eliminations | 256 |  |  | (422 | )
Total | $ | 38,820 |  |  | $ | 43,624 |
| 2019 |  | 2018
Expenditures for property, plant and equipment |  |  |
Coal Mining | $ | 15,092 |  |  | $ | 8,816 |
NAMining | 8,824 |  |  | 9,824 |
Minerals Management | 517 |  |  | 1,406 |
Unallocated Items | 231 |  |  | 884 |
Total | $ | 24,664 |  |  | $ | 20,930 |
Depreciation, depletion and amortization |  |  |
Coal Mining | $ | 12,409 |  |  | $ | 11,874 |
NAMining | 2,223 |  |  | 1,509 |
Minerals Management | 1,362 |  |  | 951 |
Unallocated Items | 246 |  |  | 349 |
Total | $ | 16,240 |  |  | $ | 14,683 |

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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