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Note 8 - Components of Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |
Unrealized holding gain (loss) on available for sale securities, tax | $ 601 | $ 146 | $ 3,127 | $ 2,149
Reclassification adjustment for gain included in net income, taxes | (3) | (34) | (20) | (38)
AOCI Attributable to Parent [Member] |  |  |  |
Unrealized holding gain (loss) on available for sale securities, tax | 601 | 146 | 3,127 | 2,149
Reclassification adjustment for gain included in net income, taxes | $ (3) | $ (34) | $ (20) | $ (38)

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