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Business Segments (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Revenue from External Customer [Line Items] |  |  |  |
Total assets | $ 542,093 | $ 523,584 |  |
Cash and cash equivalents | 19,232 | 30,521 | $ 11,846 | $ 31,422
Discontinued operations | 0 | 178 |  |
PE Films |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 102,431 | 113,613 |  |
General corporate |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 23,674 | 23,482 |  |
Subtotal |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 499,187 | 469,403 |  |
Aluminum Extrusions |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | 293,308 | 280,521 |  |
Flexible Packaging Films |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total assets | $ 103,448 | $ 75,269 |  |

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