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Note 8 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) (Parentheticals) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Unrealized holding gain on securities transferred from held to maturity to available for sale, tax | $ 237 |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | (1,378) | 1,235
Reclassification adjustment for gain included in net income, taxes |  | (1)
Unrealized holding gain on securities transferred from held to maturity to available for sale, tax | 237 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | 0 | 0
Reclassification adjustment for gain included in net income, taxes |  | 0
Unrealized holding gain on securities transferred from held to maturity to available for sale, tax | 0 |
AOCI Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | (1,378) | 1,235
Reclassification adjustment for gain included in net income, taxes |  | $ (1)
Unrealized holding gain on securities transferred from held to maturity to available for sale, tax | $ 237 |

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