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Equity Method Investment (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Net Earnings and Financial Information | TXNM presented its share of net earnings from NMRD in other income on the Consolidated Statements of Earnings. Summarized financial information for NMRD is as follows:
| December 31,
| 2024 |  | 2023 |  | 2022
| (In thousands)
Operating revenues | $ | 3,204 |  |  | $ | 13,629 |  |  | $ | 12,505 |
Operating expenses | 3,378 |  |  | 8,228 |  |  | 9,591 |
Net earnings | $ | (174) |  |  | $ | 5,401 |  |  | $ | 2,914 |
| Financial Position
| December 31,
| 2024 |  | 2023
| (In thousands)
Current assets | $ | — |  |  | $ | 2,589 |
Net property, plant, and equipment | — |  |  | 235,791 |
Non-current assets | — |  |  | 1,849 |
Total assets | — |  |  | 240,229 |
Current liabilities | — |  |  | 730 |
Non-current liabilities | — |  |  | 358 |
Owners’ equity | $ | — |  |  | $ | 239,141 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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