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Business Segments (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of Revenue by Major Customers by Reporting Segments

The following represents the revenue attributable to each of these entities as a percentage of consolidated revenue for those years:

			Percentage of Consolidated Revenue
Customer	Segment		2019			2018
Choctaw Generation Limited Partnership, LLLP	Coal Mining		48	%		60	%
CEMEX	NAMining		21	%		20	%
Ascent Resources	Minerals Management		12	%		n/a

Segment Reporting Information

The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31:

	2019				2018
Revenues
Coal Mining	$	68,701			$	81,549
NAMining	42,823				36,950
Minerals Management	30,119				17,352
Unallocated Items	790				665
Eliminations	(1,443		)		(1,141		)
Total	$	140,990			$	135,375
Operating profit (loss)
Coal Mining	$	23,268			$	38,270
NAMining	(696		)		1,918
Minerals Management	25,721				14,331
Unallocated Items	(9,729		)		(10,473		)
Eliminations	256				(422		)
Total	$	38,820			$	43,624

	2019				2018
Expenditures for property, plant and equipment
Coal Mining	$	15,092			$	8,816
NAMining	8,824				9,824
Minerals Management	517				1,406
Unallocated Items	231				884
Total	$	24,664			$	20,930
Depreciation, depletion and amortization
Coal Mining	$	12,409			$	11,874
NAMining	2,223				1,509
Minerals Management	1,362				951
Unallocated Items	246				349
Total	$	16,240			$	14,683

X

- Definition

Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer.

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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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