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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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