Note 12 - Change in Accumulated Other Comprehensive Income ("AOCI") - Change in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other comprehensive income, net of tax	$ 171	$ 2,435
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
BALANCE	(30,099)	(38,404)
Other comprehensive income (loss) before reclassification	(588)	3,762
Amounts reclassified from accumulated other comprehensive income	0	0
Other comprehensive income, net of tax	(588)	3,762
BALANCE	(30,687)	(34,642)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
BALANCE	(288)	(600)
Other comprehensive income (loss) before reclassification	0	0
Amounts reclassified from accumulated other comprehensive income	0	0
Other comprehensive income, net of tax	0	0
BALANCE	(288)	(600)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
BALANCE	(1,421)	(1,539)
Other comprehensive income (loss) before reclassification	0	0
Amounts reclassified from accumulated other comprehensive income	29	30
Other comprehensive income, net of tax	29	30
BALANCE	(1,392)	(1,509)
Accumulated Gain (Loss), Net, Fair Value Hedge, Parent [Member]
BALANCE	(828)	0
Other comprehensive income (loss) before reclassification	730	(1,357)
Amounts reclassified from accumulated other comprehensive income	0	0
Other comprehensive income, net of tax	730	(1,357)
BALANCE	(98)	(1,357)
AOCI Attributable to Parent [Member]
BALANCE	(32,636)	(40,543)
Other comprehensive income (loss) before reclassification	142	2,405
Amounts reclassified from accumulated other comprehensive income	29	30
Other comprehensive income, net of tax	171	2,435
BALANCE	$ (32,465)	$ (38,108)