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Note 13 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Balance $ 421,985 [1] $ 427,775
Other comprehensive income (loss), net of tax 2,494 (4,966)
Balance 431,731 424,156
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]    
Balance (15,621) 15
Other comprehensive income before reclassifications 2,499 (4,658)
Reclassified from AOCI (5) 0
Other comprehensive income (loss), net of tax 2,494 (4,658)
Balance (13,127) (4,643)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (98) (1,561)
Other comprehensive income before reclassifications (26) (335)
Reclassified from AOCI 26 27
Other comprehensive income (loss), net of tax 0 (308)
Balance (98) (1,869)
AOCI Attributable to Parent [Member]    
Balance (15,719) (1,546)
Other comprehensive income before reclassifications 2,473 (4,993)
Reclassified from AOCI 21 27
Other comprehensive income (loss), net of tax 2,494 (4,966)
Balance $ (13,225) $ (6,512)
[1] Derived from audited financial statements