| Segment Reporting [Table Text Block] |
| | | Three Months Ended | |
| | | June 30, | |
| | | 2026 | | | 2025 | |
| | | Refinery Operations | | | Tolling & Terminaling | | | Corporate & Other | | | Intercompany Elimination (1) | | | Consolidated | | | Refinery Operations | | | Tolling & Terminaling | | | Corporate & Other | | | Intercompany Elimination | | | Consolidated | |
| | | (in thousands) | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Segment revenue | | $ | 143,490 | | | $ | 1,465 | | | $ | - | | | $ | (700 | ) | | $ | 144,255 | | | $ | 55,795 | | | $ | 1,361 | | | $ | - | | | $ | (573 | ) | | $ | 56,583 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Crude oil, fuel use, and chemicals | | | 109,111 | | | | - | | | | - | | | | - | | | | 109,111 | | | | 50,669 | | | | - | | | | - | | | | - | | | | 50,669 | |
| Other conversion costs | | | 9,919 | | | | - | | | | - | | | | (700 | ) | | | 9,219 | | | | 5,154 | | | | - | | | | - | | | | (573 | ) | | | 4,581 | |
| Tolling and terminaling costs | | | - | | | | 179 | | | | - | | | | - | | | | 179 | | | | - | | | | 140 | | | | - | | | | - | | | | 140 | |
| Depreciation and amortization | | | 304 | | | | 342 | | | | - | | | | - | | | | 646 | | | | 301 | | | | 342 | | | | - | | | | - | | | | 643 | |
| Total costs of goods sold | | | 119,334 | | | | 521 | | | | - | | | | (700 | ) | | | 119,155 | | | | 56,124 | | | | 482 | | | | - | | | | (573 | ) | | | 56,033 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| LEH operating fee, related party | | | 259 | | | | - | | | | - | | | | - | | | | 259 | | | | 276 | | | | - | | | | - | | | | - | | | | 276 | |
| General and administrative expenses | | | 370 | | | | 69 | | | | 446 | | | | - | | | | 885 | | | | 580 | | | | 72 | | | | 52 | | | | - | | | | 704 | |
| Other operating expenses(2) | | | - | | | | - | | | | 156 | | | | - | | | | 156 | | | | - | | | | - | | | | 125 | | | | - | | | | 125 | |
| Depreciation and amortization | | | - | | | | - | | | | 74 | | | | - | | | | 74 | | | | - | | | | - | | | | 74 | | | | - | | | | 74 | |
| Interest, net | | | 621 | | | | 397 | | | | 105 | | | | - | | | | 1,123 | | | | 928 | | | | 444 | | | | 180 | | | | - | | | | 1,552 | |
| Total costs and expenses | | | 120,584 | | | | 987 | | | | 781 | | | | (700 | ) | | | 121,652 | | | | 57,908 | | | | 998 | | | | 431 | | | | (573 | ) | | | 58,764 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Income (loss) before income taxes | | | 22,906 | | | | 478 | | | | (781 | ) | | | - | | | | 22,603 | | | | (2,113 | ) | | | 363 | | | | (431 | ) | | | - | | | | (2,181 | ) |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Income tax benefit (expense) | | | - | | | | - | | | | (4,867 | ) | | | - | | | | (4,867 | ) | | | - | | | | - | | | | 459 | | | | - | | | | 459 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Net income (loss) | | $ | 22,906 | | | $ | 478 | | | $ | (5,648 | ) | | $ | - | | | $ | 17,736 | | | $ | (2,113 | ) | | $ | 363 | | | $ | 28 | | | $ | - | | | $ | (1,722 | ) |
| | | Six Months Ended | |
| | | June 30, | |
| | | 2026 | | | 2025 | |
| | | Refinery Operations | | | Tolling & Terminaling | | | Corporate & Other | | | Intercompany Elimination (1) | | | Consolidated | | | Refinery Operations | | | Tolling & Terminaling | | | Corporate & Other | | | Intercompany Elimination (1) | | | Consolidated | |
| | | (in thousands) | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Segment revenue | | $ | 224,215 | | | $ | 2,797 | | | $ | - | | | $ | (1,267 | ) | | $ | 225,745 | | | $ | 138,663 | | | $ | 2,752 | | | $ | - | | | $ | (1,140 | ) | | $ | 140,275 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Crude oil, fuel use, and chemicals | | | 166,340 | | | | - | | | | - | | | | - | | | | 166,340 | | | | 125,245 | | | | - | | | | - | | | | - | | | | 125,245 | |
| Other conversion costs | | | 13,420 | | | | - | | | | - | | | | (1,267 | ) | | | 12,153 | | | | 8,002 | | | | - | | | | - | | | | (1,140 | ) | | | 6,862 | |
| Tolling and terminaling costs | | | - | | | | 291 | | | | - | | | | - | | | | 291 | | | | - | | | | 262 | | | | - | | | | - | | | | 262 | |
| Depreciation and amortization | | | 608 | | | | 683 | | | | - | | | | - | | | | 1,291 | | | | 599 | | | | 684 | | | | - | | | | - | | | | 1,283 | |
| Total costs of goods sold | | | 180,368 | | | | 974 | | | | - | | | | (1,267 | ) | | | 180,075 | | | | 133,846 | | | | 946 | | | | - | | | | (1,140 | ) | | | 133,652 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| LEH operating fee, related party | | | 492 | | | | | | | | | | | | - | | | | 492 | | | | 458 | | | | - | | | | - | | | | - | | | | 458 | |
| General and administrative expenses | | | 918 | | | | 137 | | | | 1,002 | | | | - | | | | 2,057 | | | | 919 | | | | 160 | | | | 980 | | | | - | | | | 2,059 | |
| Gain on regulatory settlement | | | | | | | | | | | (1,013 | ) | | | | | | | (1,013 | ) | | | - | | | | - | | | | - | | | | - | | | | - | |
| Other operating expenses(2) | | | - | | | | - | | | | 317 | | | | - | | | | 317 | | | | - | | | | - | | | | 244 | | | | - | | | | 244 | |
| Depreciation and amortization | | | - | | | | | | | | 148 | | | | - | | | | 148 | | | | - | | | | - | | | | 148 | | | | - | | | | 148 | |
| Interest, net | | | 1,475 | | | | 811 | | | | 219 | | | | - | | | | 2,505 | | | | 1,764 | | | | 921 | | | | 331 | | | | - | | | | 3,016 | |
| Total costs and expenses | | | 183,253 | | | | 1,922 | | | | 673 | | | | (1,267 | ) | | | 184,581 | | | | 136,987 | | | | 2,027 | | | | 1,703 | | | | (1,140 | ) | | | 139,577 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Income (loss) before income taxes | | | 40,962 | | | | 875 | | | | (673 | ) | | | - | | | | 41,164 | | | | 1,676 | | | | 725 | | | | (1,703 | ) | | | - | | | | 698 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Income tax expense | | | - | | | | - | | | | (8,698 | ) | | | - | | | | (8,698 | ) | | | - | | | | - | | | | (176 | ) | | | - | | | | (176 | ) |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Net income (loss) | | $ | 40,962 | | | $ | 875 | | | $ | (9,371 | ) | | $ | - | | | $ | 32,466 | | | $ | 1,676 | | | $ | 725 | | | $ | (1,879 | ) | | $ | - | | | $ | 522 | |
|