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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Beginning balance			$ 350,714	[1]	$ 339,057
Other comprehensive income (loss), net	$ (104)	$ 1,480	(1,745)		2,010
Ending balance	339,121	348,775	339,121		348,775
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance	(722)	(137)	975		(544)
Other comprehensive (loss) income before reclassifications	(233)	1,028	(1,930)		1,435
Reclassified from AOCI		411			411
Other comprehensive income (loss), net	(233)	1,439	(1,930)		1,846
Ending balance	(955)	1,302	(955)		1,302
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(1,759)	(1,344)	(1,815)		(1,467)
Other comprehensive (loss) income before reclassifications	73		73		83
Reclassified from AOCI	56	41	112		81
Other comprehensive income (loss), net	129	41	185		164
Ending balance	(1,630)	(1,303)	(1,630)		(1,303)
AOCI Attributable to Parent [Member]
Beginning balance	(2,481)	(1,481)	(840)		(2,011)
Other comprehensive (loss) income before reclassifications	(160)	1,028	(1,857)		1,518
Reclassified from AOCI	56	452	112		492
Other comprehensive income (loss), net	(104)	1,480	(1,745)		2,010
Ending balance	$ (2,585)	$ (1)	$ (2,585)		$ (1)
[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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