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Note 12 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Balance $ 498,720 $ 418,046 $ 421,985 [1] $ 427,775
Other comprehensive loss, net of tax (2,983) (7,365) (1,725) (17,479)
Balance 495,667 412,258 495,667 412,258
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (14,363) (9,817) (15,621) 15
Other comprehensive loss before reclassifications (2,983) (7,392) (1,743) (17,224)
Reclassified from AOCI 0 0 18 0
Other comprehensive loss, net of tax (2,983) (7,392) (1,725) (17,224)
Balance (17,346) (17,209) (17,346) (17,209)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (98) (1,843) (98) (1,561)
Other comprehensive loss before reclassifications (28) 0 (76) (335)
Reclassified from AOCI 28 27 76 80
Other comprehensive loss, net of tax 0 27 0 (255)
Balance (98) (1,816) (98) (1,816)
AOCI Attributable to Parent [Member]        
Balance (14,461) (11,660) (15,719) (1,546)
Other comprehensive loss before reclassifications (3,011) (7,392) (1,819) (17,559)
Reclassified from AOCI 28 27 94 80
Other comprehensive loss, net of tax (2,983) (7,365) (1,725) (17,479)
Balance $ (17,444) $ (19,025) $ (17,444) $ (19,025)
[1] Derived from audited financial statements