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Note 6 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accrued retirement benefits | $ 10,036 | $ 8,031
Less current portion | (165) | (164)
Non-current portion of accrued retirement benefits | 9,871 | 7,867
Pension Plan [Member] | Qualified Plan [Member] |  |
Accrued retirement benefits | 7,971 | 5,812
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member] |  |
Accrued retirement benefits | $ 2,065 | $ 2,219

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