Inventories (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Petroleum products	$ 998,000	$ 5,840,000
Crude oil	11,834,000	37,661,000
Caustic soda	5,690,000	5,167,000
NaHS	17,040,000	9,101,000
Raw materials - Alkali Operations	7,599,000	7,120,000
Work-in-process - Alkali Operations	7,496,000	9,355,000
Finished goods, net - Alkali Operations	13,681,000	13,002,000
Materials and supplies, net - Alkali Operations	13,620,000	12,631,000
Inventories	77,958,000	99,877,000
Inventory write down	$ 2,000,000	$ 5,000,000