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Note 6 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Defined benefit pension plan | $ 8,079 | $ 11,091
Less current portion | (142) | (165)
Non-current portion of accrued retirement benefits | 7,937 | 10,926
Pension Plan [Member] | Qualified Plan [Member] |  |
Defined benefit pension plan | 5,932 | 8,790
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member] |  |
Defined benefit pension plan | $ 2,147 | $ 2,301

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