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Note 7 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accrued retirement benefits | $ 2,508 | $ 1,692
Less current portion | (140) | (142)
Non-current portion of accrued retirement benefits | 2,368 | 1,550
Pension Plan [Member] | Qualified Plan [Member] |  |
Accrued retirement benefits | 912 | (33)
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member] |  |
Accrued retirement benefits | $ 1,596 | $ 1,725

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