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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net gain (loss) on sale of securities |  |  | $ (43) |  |  | $ (618) |  |  | $ (43) | $ (618) | $ (661)
Income before income taxes | 12,397 | 11,736 | 13,402 | 12,261 | 11,902 | 10,218 | 11,566 | 11,436 | 49,796 | 45,122 | 42,113
Income tax benefit | 2,833 | 2,580 | 2,951 | 2,630 | 2,596 | 1,118 | 2,500 | 2,568 | 10,994 | 8,782 | 20,628
Net income | $ 9,564 | $ 9,156 | $ 10,451 | $ 9,631 | $ 9,306 | $ 9,100 | $ 9,066 | $ 8,868 | 38,802 | 36,340 | 21,485
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 254 | 713 | 575
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale of securities |  |  |  |  |  |  |  |  | 43 | 618 | 661
Income before income taxes |  |  |  |  |  |  |  |  | 43 | 618 | 661
Income tax benefit |  |  |  |  |  |  |  |  | (9) | (130) | (248)
Net income |  |  |  |  |  |  |  |  | 34 | 488 | 413
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | 257 | 228 | 228
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | 21 | 57 | 31
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 278 | 285 | 259
Income tax benefit |  |  |  |  |  |  |  |  | (58) | (60) | (97)
Net income |  |  |  |  |  |  |  |  | $ 220 | $ 225 | $ 162

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