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Note 6 - Accrued Retirement Benefits - Accrued Retirement Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Pension Plan [Member] |  |
Accrued retirement benefits | $ 6,264 | $ 2,540
Supplemental Employee Retirement Plan [Member] |  |
Accrued retirement benefits | 4,154 | 4,468
Deferred Compensation Plan [Member] |  |
Accrued retirement benefits | 212 | 276
Accrued retirement benefits | 10,630 | 7,284
Less current portion | 378 | 391
Non-current portion of accrued retirement benefits | $ 10,252 | $ 6,893

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