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Note 6 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accrued retirement benefits | $ 9,234 | $ 10,630
Accrued retirement benefits | 9,234 | 10,630
Less current portion | (175) | (378)
Non-current portion of accrued retirement benefits | 9,059 | 10,252
Pension Plan [Member] |  |
Accrued retirement benefits | 7,560 | 6,264
Accrued retirement benefits | 7,560 | 6,264
Supplemental Employee Retirement Plan [Member] |  |
Accrued retirement benefits | 1,674 | 4,366
Accrued retirement benefits | $ 1,674 | $ 4,366

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