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Note 9 - Employee Retirement Plans - Amounts Recognized In Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plan [Member] |  |  |
Total net (gain) loss recognized in other comprehensive (income) loss | $ 3,522 | $ (6,404) | $ (3,472)

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