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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following table disaggregates revenue by major sources for the years ended December 31:
Major Goods/Service Lines | 2024 |  | 2023
Coal Mining | $ | 68,611 |  |  | $ | 85,415 |
NAMining | 119,600 |  |  | 90,532 |
Minerals Management | 34,579 |  |  | 32,985 |
Unallocated Items | 17,707 |  |  | 8,459 |
Eliminations | (2,789) |  |  | (2,597) |
Total revenues | $ | 237,708 |  |  | $ | 214,794 |
Timing of Revenue Recognition |  |  |
Goods transferred at a point in time | $ | 66,506 |  |  | $ | 83,273 |
Services transferred over time | 171,202 |  |  | 131,521 |
Total revenues | $ | 237,708 |  |  | $ | 214,794 |
Schedule of Contract Balances | The opening and closing balances of our 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, 2024 | $ | 37,429 |  |  | $ | — |  |  | $ | 3,712 |  |  | $ | 878 |  |  | $ | 1,470 |
Balance at December 31, 2024 | 49,706 |  |  | 313 |  |  | 3,500 |  |  | 484 |  |  | 5,119 |
Increase (decrease) | $ | 12,277 |  |  | $ | 313 |  |  | $ | (212) |  |  | $ | (394) |  |  | $ | 3,649 |

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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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + 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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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