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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
Mar. 31, 2024
Mar. 31, 2023
Balance $ 503,294 [1] $ 421,985
Other comprehensive loss, net (948) 2,494
Balance 506,944 431,731
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]    
Balance (11,126) (15,621)
Other comprehensive loss before reclassifications (948) 2,499
Reclassified from AOCI 0 (5)
Other comprehensive loss, net (948) 2,494
Balance (12,074) (13,127)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance 175 (98)
Other comprehensive loss before reclassifications (7) (26)
Reclassified from AOCI 7 26
Other comprehensive loss, net 0 0
Balance 175 (98)
AOCI Attributable to Parent [Member]    
Balance (10,951) (15,719)
Other comprehensive loss before reclassifications (955) 2,473
Reclassified from AOCI 7 21
Other comprehensive loss, net (948) 2,494
Balance $ (11,899) $ (13,225)
[1] Derived from audited financial statements