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Note 7 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accrued retirement benefits | $ 1,692 | $ 2,754
Less current portion | (142) | (142)
Non-current portion of accrued retirement benefits | 1,550 | 2,612
Pension Plan [Member] | Qualified Plan [Member] |  |
Accrued retirement benefits | (33) | 1,023
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member] |  |
Accrued retirement benefits | $ 1,725 | $ 1,731

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