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Note 8 - 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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Balance | $ 195,781 | $ 183,848 | $ 183,726 | $ 190,238
Balance | 202,194 | 187,988 | 202,194 | 187,988
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |
Balance | 9,518 | 2,457 | 76 | (5,072)
Unrealized holding gain (loss) on available for sale securities, net of tax | 2,256 | 544 | 11,763 | 8,089
Reclassification adjustment, net of tax | (11) | (128) | (76) | (144)
Balance | 11,763 | 2,873 | 11,763 | 2,873
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Balance |  | (7,013) | (8,582) | (7,013)
Balance | (8,582) | (7,013) | (8,582) | (7,013)
AOCI Attributable to Parent [Member] |  |  |  |
Balance | 936 | (4,556) | (8,506) | (12,085)
Unrealized holding gain (loss) on available for sale securities, net of tax | 2,256 | 544 | 11,763 | 8,089
Reclassification adjustment, net of tax | (11) | (128) | (76) | (144)
Balance | $ 3,181 | $ (4,140) | $ 3,181 | $ (4,140)

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