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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Assets	$ 442,531	$ 446,461
Cash and cash equivalents	4,792	13,455	$ 15,025	$ 19,232
Operating Segments
Assets	442,531	446,461
Aluminum Extrusions [Member] | Operating Segments
Assets	264,300	255,756
PE Films [Member] | Operating Segments
Assets	57,925	56,536
Flexible Packaging Films [Member] | Operating Segments
Assets	81,290	84,062
Subtotal | Operating Segments
Assets	403,515	396,354
General Corporate | Operating Segments
Assets	$ 34,224	$ 36,652

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