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Note 13 - 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, 2019	Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
Beginning balance	$ 333,686	$ 339,121	$ 332,857	[1]	$ 350,714
Other comprehensive (loss) income, net of tax	76	(232)	1,124		(1,977)
Ending balance	337,363	338,402	337,363		338,402
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Beginning balance	973	(955)	(285)		975
Other comprehensive income (loss) before reclassifications	23	(776)	1,247		(2,706)
Reclassified from AOCI		488	34		488
Other comprehensive (loss) income, net of tax	23	(288)	1,281		(2,218)
Ending balance	996	(1,243)	996		(1,243)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(1,354)	(1,630)	(1,144)		(1,815)
Other comprehensive income (loss) before reclassifications	(2)	(1)	(322)		72
Reclassified from AOCI	55	57	165		169
Other comprehensive (loss) income, net of tax	53	56	(157)		241
Ending balance	(1,301)	(1,574)	(1,301)		(1,574)
AOCI Attributable to Parent [Member]
Beginning balance	(381)	(2,585)	(1,429)		(840)
Other comprehensive income (loss) before reclassifications	21	(777)	925		(2,634)
Reclassified from AOCI	55	545	199		657
Other comprehensive (loss) income, net of tax	76	(232)	1,124		(1,977)
Ending balance	$ (305)	$ (2,817)	$ (305)		$ (2,817)
[1] Derived from audited financial statements

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

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