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Business Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |
Revenues | $ 140,990 | $ 135,375
Operating profit (loss) | 38,820 | 43,624
Expenditures for property, plant and equipment | 24,664 | 20,930
Depreciation, depletion and amortization | 16,240 | 14,683
Operating Segments | Coal Mining |  |
Segment Reporting Information [Line Items] |  |
Revenues | 68,701 | 81,549
Operating profit (loss) | 23,268 | 38,270
Expenditures for property, plant and equipment | 15,092 | 8,816
Depreciation, depletion and amortization | 12,409 | 11,874
Operating Segments | NAMining |  |
Segment Reporting Information [Line Items] |  |
Revenues | 42,823 | 36,950
Operating profit (loss) | (696) | 1,918
Expenditures for property, plant and equipment | 8,824 | 9,824
Depreciation, depletion and amortization | 2,223 | 1,509
Operating Segments | Minerals Management |  |
Segment Reporting Information [Line Items] |  |
Revenues | 30,119 | 17,352
Operating profit (loss) | 25,721 | 14,331
Expenditures for property, plant and equipment | 517 | 1,406
Depreciation, depletion and amortization | 1,362 | 951
Unallocated Items |  |
Segment Reporting Information [Line Items] |  |
Revenues | 790 | 665
Operating profit (loss) | (9,729) | (10,473)
Expenditures for property, plant and equipment | 231 | 884
Depreciation, depletion and amortization | 246 | 349
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenues | (1,443) | (1,141)
Operating profit (loss) | $ 256 | $ (422)

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