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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 140,990	$ 135,375
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	66,102	78,849
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	74,888	56,526
Operating Segments | Coal Mining
Disaggregation of Revenue [Line Items]
Revenues	68,701	81,549
Operating Segments | NAMining
Disaggregation of Revenue [Line Items]
Revenues	42,823	36,950
Operating Segments | Minerals Management
Disaggregation of Revenue [Line Items]
Revenues	30,119	17,352
Unallocated Items
Disaggregation of Revenue [Line Items]
Revenues	790	665
Eliminations
Disaggregation of Revenue [Line Items]
Revenues	$ (1,443)	$ (1,141)

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+ References

No definition available.

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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