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Note 6 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accrued retirement benefits | $ 8,031 | $ 9,234
Less current portion | (164) | (175)
Non-current portion of accrued retirement benefits | 7,867 | 9,059
Pension Plan [Member] | Qualified Plan [Member] |  |
Accrued retirement benefits | 5,812 | 7,560
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member] |  |
Accrued retirement benefits | $ 2,219 | $ 1,674

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