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Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 45,896 | $ 35,355 | $ 91,001 | $ 72,999
Operating profit (loss) | 8,670 | 4,482 | 17,000 | 12,062
Expenditures for property, plant and equipment and acquisition of mineral interests | 11,251 | 7,441 | 16,127 | 12,799
Depreciation, depletion and amortization | 5,617 | 4,624 | 11,202 | 9,168
Operating segments | Coal Mining |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 23,063 | 21,573 | 46,802 | 42,501
Operating profit (loss) | 8,542 | 7,498 | 17,226 | 14,683
Expenditures for property, plant and equipment and acquisition of mineral interests | 3,115 | 3,844 | 4,732 | 4,667
Depreciation, depletion and amortization | 4,127 | 3,615 | 8,334 | 7,158
Operating segments | NAMining |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 17,486 | 12,048 | 33,628 | 23,672
Operating profit (loss) | 783 | 544 | 913 | 1,275
Expenditures for property, plant and equipment and acquisition of mineral interests | 2,952 | 3,163 | 5,818 | 7,186
Depreciation, depletion and amortization | 930 | 652 | 1,829 | 1,298
Operating segments | Minerals Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,608 | 1,987 | 11,108 | 7,228
Operating profit (loss) | 4,173 | 510 | 8,408 | 4,777
Expenditures for property, plant and equipment and acquisition of mineral interests | 5,105 | 276 | 5,498 | 739
Depreciation, depletion and amortization | 522 | 327 | 969 | 654
Unallocated Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 910 | 327 | 1,053 | 353
Operating profit (loss) | (4,795) | (4,158) | (9,568) | (8,718)
Expenditures for property, plant and equipment and acquisition of mineral interests | 79 | 158 | 79 | 207
Depreciation, depletion and amortization | 38 | 30 | 70 | 58
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (1,171) | (580) | (1,590) | (755)
Operating profit (loss) | $ (33) | $ 88 | $ 21 | $ 45

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