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Note 8 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Balance			$ 184,896	$ 178,263
Balance	$ 185,851	$ 184,286	185,851	184,286
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237	891		891
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance			(3,704)	(3,588)
Unrealized holding gain (loss) on available for sale securities, net of tax			(3,237)	2,701
Balance	(6,050)	(887)	(6,050)	(887)
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237			891
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance			(5,991)	(5,071)
Unrealized holding gain (loss) on available for sale securities, net of tax				0
Balance	(5,991)	(5,071)	(5,991)	(5,071)
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237
AOCI Attributable to Parent [Member]
Balance			(9,695)	(8,659)
Unrealized holding gain (loss) on available for sale securities, net of tax			(3,237)	2,701
Balance	$ (12,041)	$ (5,958)	(12,041)	$ (5,958)
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237			$ 891

X

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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