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Revenue Recognition (Tables) | 12 Months Ended
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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 |

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- 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 + Details
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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 https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 + Details
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