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Note 8 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Unrealized holding gain on securities transferred from held to maturity to available for sale, tax | $ 237 |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | 2,149 | $ (1,378)
Unrealized holding gain on securities transferred from held to maturity to available for sale, tax |  | 237
Reclassification adjustment for gain included in net income, taxes | (38) |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | 0 | 0
Unrealized holding gain on securities transferred from held to maturity to available for sale, tax |  | 0
Reclassification adjustment for gain included in net income, taxes | 0 |
AOCI Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | 2,149 | (1,378)
Unrealized holding gain on securities transferred from held to maturity to available for sale, tax |  | $ 237
Reclassification adjustment for gain included in net income, taxes | $ (38) |

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