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Note 11 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Balance $ 526,392 [1] $ 503,294
Other comprehensive gain (loss), net of tax 1,666 (948)
Other comprehensive loss, net 1,666 (948)
Balance 496,417 506,944
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]    
Balance (11,723) (11,126)
Other comprehensive income before reclassifications 1,666 (948)
Reclassified from AOCI 0 0
Other comprehensive gain (loss), net of tax 1,666 (948)
Other comprehensive loss, net 1,666 (948)
Balance (10,057) (12,074)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance 552 175
Other comprehensive income before reclassifications (4) (7)
Reclassified from AOCI 4 7
Other comprehensive gain (loss), net of tax 0 0
Other comprehensive loss, net 0 0
Balance 552 175
AOCI Attributable to Parent [Member]    
Balance (11,171) (10,951)
Other comprehensive income before reclassifications 1,662 (955)
Reclassified from AOCI 4 7
Other comprehensive gain (loss), net of tax 1,666 (948)
Other comprehensive loss, net 1,666 (948)
Balance $ (9,505) $ (11,899)
[1] Derived from audited financial statements