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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Balance | $ 191,559 | $ 181,228 | $ 183,726 | $ 190,238
Balance | 195,781 | 183,848 | 195,781 | 183,848
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |
Balance | 3,930 | (528) | 76 | (5,072)
Unrealized holding gain (loss) on available for sale securities, net of tax | 5,637 | 2,991 | 9,507 | 7,545
Reclassification adjustment, net of tax | (49) | (6) | (65) | (16)
Balance | 9,518 | 2,457 | 9,518 | 2,457
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Balance | (8,582) | (7,013) | (8,582) | (7,013)
Balance | (8,582) | (7,013) | (8,582) | (7,013)
AOCI Attributable to Parent [Member] |  |  |  |
Balance | (4,652) | (7,541) | (8,506) | (12,085)
Unrealized holding gain (loss) on available for sale securities, net of tax | 5,637 | 2,991 | 9,507 | 7,545
Reclassification adjustment, net of tax | (49) | (6) | (65) | (16)
Balance | $ 936 | $ (4,556) | $ 936 | $ (4,556)

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