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Note 7 - Components of Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Unrealized holding gain (loss) on available for sale securities, tax | $ 1,922 |  | $ (1,349) |
Reclassification adjustment for gain included in net income, taxes |  |  | $ (1) |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |
Unrealized holding gain (loss) on available for sale securities, tax |  | $ 1,498 |  | $ 2,526
Reclassification adjustment for gain included in net income, taxes |  | (13) |  | (17)
AOCI Attributable to Parent [Member] |  |  |  |
Unrealized holding gain (loss) on available for sale securities, tax |  | 1,498 |  | 2,526
Reclassification adjustment for gain included in net income, taxes |  | $ (13) |  | $ (17)

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