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Note 9 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Accrued retirement benefits | $ 8,004 | $ 8,079
Less current portion | 142 | 142
Non-current portion of accrued retirement benefits | 7,862 | 7,937
Pension Plan [Member] | Qualified Plan [Member] |  |
Accrued retirement benefits | 5,875 | 5,932
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member] |  |
Accrued retirement benefits | $ 2,129 | $ 2,147

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