| In millions, except per share items | Jun-30-23 | Jun-05-23 | Mar-31-23 | Dec-05-22 | Jun-30-22 | Jun-05-22 | Mar-31-22 | Dec-31-21 |
| | 10-Q | 8-K | 10-Q | 8-K | 10-Q | 8-K | 10-Q | 10-K |
| Revenues |
| Railroad and Utility Products and Services | 234.4 | | 213.1 | | 204.2 | | 183.4 | |
| Carbon Materials & Chemicals | 180.9 | | 153.4 | | 149.6 | | 139.5 | |
| Performance Chemicals | 180.9 | | 146.9 | | 149.6 | | 136.4 | |
| |
| EBITDA |
| Railroad and Utility Products and Services | 5.8 | | 5.9 | | 5.5 | | 5.4 | |
| Carbon Materials & Chemicals | 5.1 | | 4.6 | | 4.1 | | 4.9 | |
| Performance Chemicals | 3.5 | | 3.5 | | 3.8 | | 3.9 | |
| Corporate | | | | | | | | 3.7 |
| |
| EBIT |
| Corporate | | | | | | | | 3.7 |
| |
| Mix |
| Railroad and Utility Products and Services | 40.6% | | 41.5% | | 40.6% | | 39.9% | |
| Carbon Materials & Chemicals | 31.3% | | 29.9% | | 29.8% | | 30.4% | |
| Performance Chemicals | 31.3% | | 28.6% | | 29.8% | | 29.7% | |
| |
| Growth |
| Railroad and Utility Products and Services | 14.8% | | 16.2% | | 4.5% | | -4.4% | |
| Carbon Materials & Chemicals | 20.9% | | 10.0% | | 49.7% | | 51.6% | |
| Performance Chemicals | 20.9% | | 7.7% | | 2.7% | | 10.4% | |