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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Balance $ 502,829 $ 508,884 $ 526,392 [1] $ 503,294
Other comprehensive gain, net of tax 1,093 4,005 3,117 2,542
Other comprehensive loss, net 1,093 4,005 3,117 2,542
Balance 510,725 520,694 510,725 520,694
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (9,699) (12,589) (11,723) (11,126)
Other comprehensive income before reclassifications 1,093 4,005 3,117 2,542
Reclassified from AOCI 0 0 0 0
Other comprehensive gain, net of tax 1,093 4,005 3,117 2,542
Other comprehensive loss, net 1,093 4,005 3,117 2,542
Balance (8,606) (8,584) (8,606) (8,584)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance 552 175 552 175
Other comprehensive income before reclassifications 4 (7) 13 (22)
Reclassified from AOCI (4) 7 (13) 22
Other comprehensive gain, 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 (9,147) (12,414) (11,171) (10,951)
Other comprehensive income before reclassifications 1,097 3,998 3,130 2,520
Reclassified from AOCI (4) 7 (13) 22
Other comprehensive gain, net of tax 1,093 4,005 3,117 2,542
Other comprehensive loss, net 1,093 4,005 3,117 2,542
Balance $ (8,054) $ (8,409) $ (8,054) $ (8,409)
[1] Derived from audited financial statements