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Inventories (Major Components of Inventories) (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
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Inventory Disclosure [Abstract] |  |
Crude oil | $ 33,812,000 | $ 20,381,000
NaHS | 7,713,000 | 10,902,000
Caustic soda | 7,713,000 | 6,499,000
Total | $ 49,238,000 | $ 37,782,000

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