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Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 37,644	$ 40,097
Operating profit (loss)	7,580	16,373
Expenditures for property, plant and equipment	5,358	4,252
Depreciation, depletion and amortization	4,544	3,813
Operating segments | Coal Mining
Segment Reporting Information [Line Items]
Revenues	20,928	16,750
Operating profit (loss)	7,185	10,007
Expenditures for property, plant and equipment	823	2,740
Depreciation, depletion and amortization	3,543	2,874
Operating segments | NAMining
Segment Reporting Information [Line Items]
Revenues	11,624	10,775
Operating profit (loss)	731	65
Expenditures for property, plant and equipment	4,023	1,130
Depreciation, depletion and amortization	646	545
Operating segments | Minerals Management
Segment Reporting Information [Line Items]
Revenues	5,241	12,686
Operating profit (loss)	4,267	11,669
Expenditures for property, plant and equipment	463	241
Depreciation, depletion and amortization	327	366
Unallocated Items
Segment Reporting Information [Line Items]
Revenues	26	543
Operating profit (loss)	(4,560)	(5,134)
Expenditures for property, plant and equipment	49	141
Depreciation, depletion and amortization	28	28
Eliminations
Segment Reporting Information [Line Items]
Revenues	(175)	(657)
Operating profit (loss)	$ (43)	$ (234)

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