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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018
Beginning balance	$ 333,102	$ 342,037	$ 332,857	[1]	$ 350,714
Other comprehensive income, net	352	(104)	1,048		(1,745)
Ending balance	333,686	339,121	333,686		339,121
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Beginning balance	677	(722)	(285)		975
Other comprehensive loss before reclassifications	262	(233)	1,224		(1,930)
Reclassified from AOCI	34		34
Other comprehensive income, net	296	(233)	1,258		(1,930)
Ending balance	973	(955)	973		(955)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(1,410)	(1,759)	(1,144)		(1,815)
Other comprehensive loss before reclassifications		73	(320)		73
Reclassified from AOCI	56	56	110		112
Other comprehensive income, net	56	129	(210)		185
Ending balance	(1,354)	(1,630)	(1,354)		(1,630)
AOCI Attributable to Parent [Member]
Beginning balance	(733)	(2,481)	(1,429)		(840)
Other comprehensive loss before reclassifications	262	(160)	904		(1,857)
Reclassified from AOCI	90	56	144		112
Other comprehensive income, net	352	(104)	1,048		(1,745)
Ending balance	$ (381)	$ (2,585)	$ (381)		$ (2,585)
[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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