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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Balance $ 496,417 $ 506,944 $ 526,392 [1] $ 503,294
Other comprehensive gain (loss), net of tax 358 (515) 2,024 (1,463)
Other comprehensive loss, net 358 (515) 2,024 (1,463)
Balance 502,829 508,884 502,829 508,884
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (10,057) (12,074) (11,723) (11,126)
Other comprehensive income before reclassifications 358 (515) 2,024 (1,463)
Reclassified from AOCI 0 0 0 0
Other comprehensive gain (loss), net of tax 358 (515) 2,024 (1,463)
Other comprehensive loss, net 358 (515) 2,024 (1,463)
Balance (9,699) (12,589) (9,699) (12,589)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance 552 175 552 175
Other comprehensive income before reclassifications 13 (7) 8 (15)
Reclassified from AOCI (13) 7 (8) 15
Other comprehensive gain (loss), net of tax 0 0 0 0
Other comprehensive loss, net 0 0 0 0
Balance 552 175 552 175
AOCI Attributable to Parent [Member]        
Balance (9,505) (11,899) (11,171) (10,951)
Other comprehensive income before reclassifications 371 (522) 2,032 (1,478)
Reclassified from AOCI (13) 7 (8) 15
Other comprehensive gain (loss), net of tax 358 (515) 2,024 (1,463)
Other comprehensive loss, net 358 (515) 2,024 (1,463)
Balance $ (9,147) $ (12,414) $ (9,147) $ (12,414)
[1] Derived from audited financial statements