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Note 4 - Comprehensive Income - Changes in the Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Balance	$ 244,452	$ 197,368
Other comprehensive income during three months ended March 31, 2020	5,783	3,529
Balance	251,228	202,127
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	3,511	(4,307)
Other comprehensive income during three months ended March 31, 2020	5,719	3,366
Balance	9,230	(941)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	180	137
Other comprehensive income during three months ended March 31, 2020	64	163
Balance	244	300
AOCI Attributable to Parent [Member]
Balance	3,691	(4,170)
Other comprehensive income during three months ended March 31, 2020	5,783	3,529
Balance	$ 9,474	$ (641)

X

- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

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