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Note 15 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Balance | $ 426,730 | $ 428,819 | $ 332,857
Other comprehensive (loss) income, net | 377 | (417) | (77)
Balance | 427,775 | 426,730 | 428,819
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |
Balance | 1,106 | 866 | (285)
Other comprehensive income (loss) before reclassifications | (1,091) | 544 | 1,117
Reclassified from AOCI | 0 | (304) | 34
Other comprehensive (loss) income, net | (1,091) | 240 | 1,151
Balance | 15 | 1,106 | 866
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balance | (3,029) | (2,372) | (1,144)
Other comprehensive income (loss) before reclassifications | 1,160 | (961) | (1,448)
Reclassified from AOCI | 308 | 304 | 220
Other comprehensive (loss) income, net | 1,468 | (657) | (1,228)
Balance | (1,561) | (3,029) | (2,372)
AOCI Attributable to Parent [Member] |  |  |
Balance | (1,923) | (1,506) | (1,429)
Other comprehensive income (loss) before reclassifications | 69 | (417) | (331)
Reclassified from AOCI | 308 | 0 | 254
Other comprehensive (loss) income, net | 377 | (417) | (77)
Balance | $ (1,546) | $ (1,923) | $ (1,506)

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