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Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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

Major Goods/Service Lines			2022						2021
Coal Mining			$	95,204					$	82,831
NAMining			85,664						78,944
Minerals Management			60,242						31,003
Unallocated Items			2,952						4,695
Eliminations			(2,343)						(5,627)
Total revenues			$	241,719					$	191,846
Timing of Revenue Recognition
Goods transferred at a point in time			$	92,842					$	80,515
Services transferred over time			148,877						111,331
Total revenues			$	241,719					$	191,846

Contract Balances

The opening and closing balances of the Company’s 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, 2022			$	25,667					$	—					$	5,985					$	4,082					$	1,453
Balance at December 31, 2022			37,940						409						5,985						833						1,709
Increase (decrease)			$	12,273					$	409					$	—					$	(3,249)					$	256

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

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X

- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045

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- References

No definition available.

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