Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2025

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following table disaggregates revenue by major sources for the years ended December 31:

Major Goods/Service Lines	2025		2024
Utility Coal Mining	$	88,188	$	68,611
Contract Mining	140,013		119,600
Minerals and Royalties	37,630		34,579
Unallocated Items	15,080		17,707
Eliminations	(3,713)		(2,789)
Total revenues	$	277,198	$	237,708
Timing of Revenue Recognition
Transferred at a point in time	$	92,331	$	66,506
Transferred over time	184,867		171,202
Total revenues	$	277,198	$	237,708

Schedule of Contract Balances

The opening and closing balances of our current and long-term contract assets and liabilities and receivables are as follows:

	Contract balances
	Trade accounts receivable		Contract asset (current)		Contract asset (long-term)		Contract liability (current)		Contract liability (long-term)
Balance at January 1, 2025	$	49,706	$	313	$	3,500	$	484	$	5,119
Balance at December 31, 2025	42,921		382		3,500		1,358		10,593
Increase (decrease)	$	(6,785)	$	69	$	—	$	874	$	5,474