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Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 32,295 | $ 32,603 | $ 105,294 | $ 114,052
Operating profit (loss) | 9,398 | 8,663 | 21,460 | 34,197
Expenditures for property, plant and equipment | 7,003 | 7,297 | 19,802 | 13,264
Depreciation, depletion and amortization | 4,876 | 4,044 | 14,044 | 12,095
Operating segments | Coal Mining |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 20,395 | 18,799 | 62,896 | 58,119
Operating profit (loss) | 11,174 | 10,492 | 25,857 | 27,761
Expenditures for property, plant and equipment | 3,150 | 2,291 | 7,817 | 6,542
Depreciation, depletion and amortization | 3,793 | 3,102 | 10,951 | 9,252
Operating segments | NAMining |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 9,443 | 8,993 | 33,115 | 30,496
Operating profit (loss) | 244 | (358) | 1,519 | (743)
Expenditures for property, plant and equipment | 3,220 | 4,971 | 10,406 | 6,213
Depreciation, depletion and amortization | 723 | 588 | 2,021 | 1,699
Operating segments | Minerals Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,722 | 5,022 | 9,950 | 25,950
Operating profit (loss) | 1,673 | 3,900 | 6,450 | 22,358
Expenditures for property, plant and equipment | 633 | 0 | 1,372 | 291
Depreciation, depletion and amortization | 327 | 324 | 981 | 1,057
Unallocated Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 904 | 52 | 1,257 | 726
Operating profit (loss) | (3,623) | (5,470) | (12,341) | (15,336)
Expenditures for property, plant and equipment | 0 | 35 | 207 | 218
Depreciation, depletion and amortization | 33 | 30 | 91 | 87
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (1,169) | (263) | (1,924) | (1,239)
Operating profit (loss) | $ (70) | $ 99 | $ (25) | $ 157

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