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Note 16 - Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net (loss) gain on sale of securities |  | $ (618) |  |  | $ (4) |  | $ (657) |  | $ (618) | $ (661) | $ 335
Net impairment losses recognized in earnings |  |  |  |  |  |  |  |  |  |  | 4,646
Income before income taxes | 11,902 | 10,218 | 11,566 | 11,436 | 11,933 | 11,546 | 9,377 | 9,257 | 45,122 | 42,113 | 37,945
Income tax expense | 2,596 | 1,118 | 2,500 | 2,568 | 10,720 | 3,894 | 2,959 | 3,055 | 8,782 | 20,628 | 12,819
Net income | $ 9,306 | $ 9,100 | $ 9,066 | $ 8,868 | $ 1,213 | $ 7,652 | $ 6,418 | $ 6,202 | 36,340 | 21,485 | 25,126
Net income |  |  |  |  |  |  |  |  | 713 | 575 | 2,865
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 228 | 228 | 226
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 57 | 31 | 47
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 285 | 259 | 273
Income tax expense |  |  |  |  |  |  |  |  | (60) | (97) | (102)
Net income |  |  |  |  |  |  |  |  | 225 | 162 | 171
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Net (loss) gain on sale of securities |  |  |  |  |  |  |  |  | 618 | 661 | (335)
Net impairment losses recognized in earnings |  |  |  |  |  |  |  |  |  |  | 4,646
Income before income taxes |  |  |  |  |  |  |  |  | 618 | 661 | 4,311
Income tax expense |  |  |  |  |  |  |  |  | (130) | (248) | (1,617)
Net income |  |  |  |  |  |  |  |  | $ 488 | $ 413 | $ 2,694

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