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Note 6 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Balances | $ 122,687 | $ 191,751
Balances | 131,043 | 161,289
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |
Balances | (81,421) | 2,854
Unrealized holding gain (loss) on available for sale securities, net of tax | 11,738 | (33,826)
Reclassification adjustment, net of tax of ($3) | (9) |
Balances | (69,692) | (30,972)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
Balances | (2,345) | (6,912)
Unrealized holding gain (loss) on available for sale securities, net of tax | 0 |
Reclassification adjustment, net of tax of ($3) | 0 |
Balances | (2,345) | (6,912)
AOCI Attributable to Parent [Member] |  |
Balances | (83,766) | (4,058)
Unrealized holding gain (loss) on available for sale securities, net of tax | 11,738 | (33,826)
Reclassification adjustment, net of tax of ($3) | (9) |
Balances | $ (72,037) | $ (37,884)

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