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Inventories (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Inventory Disclosure [Abstract] |  |
Petroleum products | $ 0 | $ 56,000
Crude oil | 22,320,000 | 6,673,000
Caustic soda | 9,150,000 | 15,258,000
NaHS | 17,605,000 | 7,085,000
Raw materials - Alkali Business | 8,355,000 | 5,819,000
Work-in-process - Alkali Business | 11,404,000 | 9,599,000
Finished goods, net - Alkali Business | 48,706,000 | 18,772,000
Materials and supplies, net - Alkali Business | 17,691,000 | 14,881,000
Inventories | 135,231,000 | 78,143,000
Inventory write down | $ 200,000 | $ 2,900,000

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