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Note 7 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Balance $ 148,963 $ 128,444 $ 140,522 $ 122,687
Balance 167,782 116,113 167,782 116,113
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (66,044) (71,898) (62,556) (81,421)
Unrealized holding gain (loss) on available for sale securities, net of tax 16,115 (15,421) 12,627 (8,530)
Reclassification adjustment, net of tax of $700       2,632
Balance (49,929) (87,319) (49,929) (87,319)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (2,310) (2,345) (2,310) (2,345)
Unrealized holding gain (loss) on available for sale securities, net of tax 0 0 0 0
Reclassification adjustment, net of tax of $700       0
Balance (2,310) (2,345) (2,310) (2,345)
AOCI Attributable to Parent [Member]        
Balance (68,354) (74,243) (64,866) (83,766)
Unrealized holding gain (loss) on available for sale securities, net of tax 16,115 (15,421) 12,627 (8,530)
Reclassification adjustment, net of tax of $700       2,632
Balance $ (52,239) $ (89,664) $ (52,239) $ (89,664)