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Note 12 - 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, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Beginning balance			$ 350,714	[1]	$ 339,057
Other comprehensive income (loss), net	$ (232)	$ (66)	(1,977)		1,944
Ending balance	338,402	352,637	338,402		352,637
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance	(955)	1,302	975		(544)
Other comprehensive (loss) income before reclassifications	(776)	(106)	(2,706)		1,329
Reclassified from AOCI	488		488		411
Other comprehensive income (loss), net	(288)	(106)	(2,218)		1,740
Ending balance	(1,243)	1,196	(1,243)		1,196
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(1,630)	(1,303)	(1,815)		(1,467)
Other comprehensive (loss) income before reclassifications	(1)	(1)	72		83
Reclassified from AOCI	57	41	169		121
Other comprehensive income (loss), net	56	40	241		204
Ending balance	(1,574)	(1,263)	(1,574)		(1,263)
AOCI Attributable to Parent [Member]
Beginning balance	(2,585)	(1)	(840)		(2,011)
Other comprehensive (loss) income before reclassifications	(777)	(107)	(2,634)		1,412
Reclassified from AOCI	545	41	657		532
Other comprehensive income (loss), net	(232)	(66)	(1,977)		1,944
Ending balance	$ (2,817)	$ (67)	$ (2,817)		$ (67)
[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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