Inventories (Major Components of Inventories) (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Crude oil	$ 31,783,000	$ 22,320,000
Caustic soda	6,496,000	9,150,000
NaHS	8,881,000	17,605,000
Raw materials - Alkali Business	9,291,000	8,355,000
Work-in-process - Alkali Business	3,416,000	11,404,000
Finished goods, net - Alkali Business	30,601,000	48,706,000
Materials and supplies, net - Alkali Business	20,219,000	17,691,000
Total	$ 110,687,000	$ 135,231,000