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Note 12 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income before income taxes |  | $ 11,436 | $ 9,257
Income tax expense |  | 2,568 | 3,055
Net income |  | 8,868 | 6,202
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Net income |  | 56 | 40
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Amortization | [1] | 59 | 57
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Amortization | [1] | 12 | 7
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Income before income taxes |  | 71 | 64
Income tax expense |  | 15 | 24
Net income |  | $ 56 | $ 40
[1] | Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."

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