| Segment Reporting Disclosure [Text Block] |
| (15) | SEGMENTS OF BUSINESS |
As of June 30, 2023, our operations are divided into two primary reportable segments, the Coal Operations and Electric Operations segments. The remainder of our operations, which are not significant enough on a stand-alone basis to warrant treatment as an operating segment, are presented as "Corporate and Other and Eliminations" and primarily are comprised of unallocated corporate costs and activities, the elimination of coal sales from coal operations to electric operations, a 50% interest in Sunrise Energy, LLC, a private gas exploration company with operations in Indiana, which we account for using the equity method, and our wholly-owned subsidiary Summit Terminal LLC, a logistics transport facility located on the Ohio River.
| | | Three Months Ended June 30, | | | Six Months Ended June 30, | |
| | | 2023 | | | 2022 | | | 2023 | | | 2022 | |
| | | (in thousands) | | | (in thousands) | |
| Operating Revenues | | | | | | | | | | | | | | | | |
| Coal Operations | | $ | 113,098 | | | $ | 65,323 | | | $ | 208,371 | | | $ | 123,660 | |
| Electric Operations | | | 71,103 | | | | - | | | | 163,597 | | | | - | |
| Corporate and Other and Eliminations | | | (23,007 | ) | | | 606 | | | | (22,440 | ) | | | 1,176 | |
| Consolidated Operating Revenues | | $ | 161,194 | | | $ | 65,929 | | | $ | 349,528 | | | $ | 124,836 | |
| | | | | | | | | | | | | | | | | |
| Income (Loss) from Operations | | | | | | | | | | | | | | | | |
| Coal Operations | | $ | 26,363 | | | $ | 1,928 | | | $ | 39,451 | | | $ | (5,518 | ) |
| Electric Operations | | | 9,256 | | | | - | | | | 27,961 | | | | - | |
| Corporate and Other and Eliminations | | | (13,375 | ) | | | (2,744 | ) | | | (15,935 | ) | | | (3,975 | ) |
| Consolidated Income (Loss) from Operations | | $ | 22,244 | | | $ | (816 | ) | | $ | 51,477 | | | $ | (9,493 | ) |
| | | | | | | | | | | | | | | | | |
| Depreciation, Depletion and Amortization | | | | | | | | | | | | | | | | |
| Coal Operations | | $ | 12,466 | | | $ | 11,127 | | | $ | 25,741 | | | $ | 20,623 | |
| Electric Operations | | | 4,675 | | | | - | | | | 9,350 | | | | - | |
| Corporate and Other and Eliminations | | | 28 | | | | 37 | | | | 54 | | | | 72 | |
| Consolidated Depreciation, Depletion and Amortization | | $ | 17,169 | | | $ | 11,164 | | | $ | 35,145 | | | $ | 20,695 | |
| | | | | | | | | | | | | | | | | |
| Assets | | | | | | | | | | | | | | | | |
| Coal Operations | | $ | 387,653 | | | $ | 367,723 | | | $ | 387,653 | | | $ | 367,723 | |
| Electric Operations | | | 216,665 | | | | - | | | | 216,665 | | | | - | |
| Corporate and Other and Eliminations | | | (4,429 | ) | | | 8,012 | | | | (4,429 | ) | | | 8,012 | |
| Consolidated Assets | | $ | 599,889 | | | $ | 375,735 | | | $ | 599,889 | | | $ | 375,735 | |
| | | | | | | | | | | | | | | | | |
| Capital Expenditures | | | | | | | | | | | | | | | | |
| Coal Operations | | $ | 14,445 | | | $ | 13,821 | | | $ | 27,084 | | | $ | 22,903 | |
| Electric Operations | | | 2,683 | | | | - | | | | 3,526 | | | | - | |
| Corporate and Other and Eliminations | | | - | | | | - | | | | - | | | | - | |
| Consolidated Capital Expenditures | | $ | 17,128 | | | $ | 13,821 | | | $ | 30,610 | | | $ | 22,903 | |
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