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Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2021

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			2021						2020
Coal Mining			$	91,851					$	72,088
NAMining			69,924						42,392
Minerals Management			31,003						14,721
Unallocated Items			4,695						2,133
Eliminations			(5,627)						(2,902)
Total revenues			$	191,846					$	128,432
Timing of Revenue Recognition
Goods transferred at a point in time			$	80,515					$	68,073
Services transferred over time			111,331						60,359
Total revenues			$	191,846					$	128,432

Contract Balances

The opening and closing balances of the Company’s current and long-term contract liabilities and receivables are as follows:

			Contract balances
			Trade accounts receivable						Contract asset (long-term)						Contract liability (current)						Contract liability (long-term)
Balance at January 1, 2021			$	18,894					$	4,984					$	941					$	3,626
Balance at December 31, 2021			25,667						5,985						4,082						488
Increase (decrease)			$	6,773					$	1,001					$	3,141					$	(3,138)

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 http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045

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- 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 http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045

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- References

No definition available.

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