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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 237,708	$ 214,794
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	66,506	83,273
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	171,202	131,521
Operating Segments | Coal Mining
Disaggregation of Revenue [Line Items]
Revenues	68,611	85,415
Operating Segments | NAMining
Disaggregation of Revenue [Line Items]
Revenues	119,600	90,532
Operating Segments | Minerals Management
Disaggregation of Revenue [Line Items]
Revenues	34,579	32,985
Unallocated Items
Disaggregation of Revenue [Line Items]
Revenues	17,707	8,459
Eliminations
Disaggregation of Revenue [Line Items]
Revenues	$ (2,789)	$ (2,597)

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