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Note 7 - Components of Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Balance | $ 191,235 | $ 195,781 | $ 200,607 | $ 183,726
Balance | 190,853 | 202,194 | 190,853 | 202,194
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |
Balance | 8,089 | 9,518 | 13,167 | 76
Unrealized holding gain (loss) on available for sale securities, net of tax | (3,403) | 2,256 | (8,477) | 11,763
Reclassification adjustment, net of tax |  | (11) | (4) | (76)
Balance | 4,686 | 11,763 | 4,686 | 11,763
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Balance | (10,147) | (8,582) | (10,147) | (8,582)
Balance | (10,147) | (8,582) | (10,147) | (8,582)
AOCI Attributable to Parent [Member] |  |  |  |
Balance | (2,058) | 936 | 3,020 | (8,506)
Unrealized holding gain (loss) on available for sale securities, net of tax | (3,403) | 2,256 | (8,477) | 11,763
Reclassification adjustment, net of tax |  | (11) | (4) | (76)
Balance | $ (5,461) | $ 3,181 | $ (5,461) | $ 3,181

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