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Note 7 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | $ (8,992) | $ (3,271)
Reclassification adjustment for gain included in net income, taxes |  | (1)
AOCI Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | $ (8,992) | (3,271)
Reclassification adjustment for gain included in net income, taxes |  | $ (1)

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