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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)