Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Property, plant and equipment	$ (1,402)	$ (1,438)
Turnaround costs	(230)	(218)
Total deferred tax liabilities	(1,632)	(1,656)
Noncurrent deferred tax liability	$ (1,632)	$ (1,656)