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Note 6 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined benefit pension plans | $ 11,091 | $ 9,867
Less current portion | (165) | (165)
Non-current portion of accrued retirement benefits | 10,926 | 9,702
Pension Plan [Member] | Qualified Plan [Member] |  |
Defined benefit pension plans | 8,790 | 7,658
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member] |  |
Defined benefit pension plans | $ 2,301 | $ 2,209

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