Business Segments (Tables)

6 Months Ended

Jun. 30, 2022

Segment Reporting [Abstract]

Segment Reporting Information

The following tables present revenue, operating profit, depreciation expense and capital expenditures:

	THREE MONTHS ENDED				SIX MONTHS ENDED
	JUNE 30				JUNE 30
	2022		2021		2022		2021
Revenues
Coal Mining	$	26,602	$	20,689	$	47,564	$	42,631
NAMining	22,814		19,860		44,218		37,799
Minerals Management	11,962		5,608		24,716		11,108
Unallocated Items	617		910		809		1,053
Eliminations	(626)		(1,171)		(915)		(1,590)
Total	$	61,369	$	45,896	$	116,392	$	91,001
Operating profit (loss)
Coal Mining	$	21,175	$	7,627	$	28,527	$	15,784
NAMining	1,257		1,698		2,528		2,355
Minerals Management	13,073		4,173		24,701		8,408
Unallocated Items	(5,952)		(4,795)		(11,391)		(9,568)
Eliminations	130		(33)		262		21
Total	$	29,683	$	8,670	$	44,627	$	17,000

	THREE MONTHS ENDED				SIX MONTHS ENDED
	JUNE 30				JUNE 30
	2022		2021		2022		2021
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining	$	6,280	$	3,115	$	8,000	$	4,732
NAMining	6,561		2,952		8,381		5,818
Minerals Management	116		5,105		949		5,498
Unallocated Items	7,312		79		7,588		79
Total	$	20,269	$	11,251	$	24,918	$	16,127
Depreciation, depletion and amortization
Coal Mining	$	4,388	$	4,073	$	8,426	$	8,228
NAMining	1,493		984		2,960		1,935
Minerals Management	543		522		1,121		969
Unallocated Items	64		38		108		70
Total	$	6,488	$	5,617	$	12,615	$	11,202