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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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