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Note 6 - Components of Accumulated Other Comprehensive 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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |  |
Unrealized holding gain (loss) on available for sale securities, tax | $ (1,289) | $ (6,617) | $ 1,831 | $ (15,609)
Reclassification adjustment for gain included in net income, taxes | 702 |  | 700 |
AOCI Attributable to Parent [Member] |  |  |  |
Unrealized holding gain (loss) on available for sale securities, tax | (1,289) | $ (6,617) | 1,831 | $ (15,609)
Reclassification adjustment for gain included in net income, taxes | $ 702 |  | $ 700 |

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