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Note 6 - Employee Benefit Plans - Accumulated Benefit Obligations (Details) - Plan Assets Exceed ABO [Member] - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 149,426 | $ 148,143
Accumulated benefit obligation | 146,336 | 144,816
Fair value of plan assets | $ 176,958 | $ 175,159

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