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Note 12 - Change in Accumulated Other Comprehensive Income ("AOCI") - Change in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Net other comprehensive income (loss) $ (522) $ 2,043
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]    
BALANCE (20,058) (28,210)
Other comprehensive income before reclassification (846) 2,439
Amounts reclassified from accumulated other comprehensive income 0 0
Net other comprehensive income (loss) (846) 2,439
BALANCE (20,904) (25,771)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
BALANCE (387) (486)
Other comprehensive income before reclassification 0 0
Amounts reclassified from accumulated other comprehensive income 0 0
Net other comprehensive income (loss) 0 0
BALANCE (387) (486)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]    
BALANCE (1,184) (1,303)
Other comprehensive income before reclassification 0 0
Amounts reclassified from accumulated other comprehensive income 29 29
Net other comprehensive income (loss) 29 29
BALANCE (1,155) (1,274)
Accumulated Gain (Loss), Net, Fair Value Hedge, Parent [Member]    
BALANCE (769) (173)
Other comprehensive income before reclassification 0 0
Amounts reclassified from accumulated other comprehensive income 295 (425)
Net other comprehensive income (loss) 295 (425)
BALANCE (474) (598)
AOCI Attributable to Parent [Member]    
BALANCE (22,398) (30,172)
Other comprehensive income before reclassification (846) 2,439
Amounts reclassified from accumulated other comprehensive income 324 (396)
Net other comprehensive income (loss) (522) 2,043
BALANCE $ (22,920) $ (28,129)