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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
Mar. 31, 2025
Mar. 31, 2024
Balance $ 156,409 $ 140,522
Balance 167,278 139,390
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]    
Balance (62,093) (62,556)
Unrealized holding gain (loss) on available for sale securities, net of tax 7,590 (3,338)
Balance (54,503) (65,894)
AOCI Attributable to Parent [Member]    
Balance (61,765) (64,866)
Unrealized holding gain (loss) on available for sale securities, net of tax 7,590 (3,338)
Balance (54,175) (68,204)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance 328 (2,310)
Unrealized holding gain (loss) on available for sale securities, net of tax 0 0
Balance $ 328 $ (2,310)