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Note 11 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Beginning balance			$ 339,057	[1]	$ 343,017
Other comprehensive income (loss), net	$ (66)	$ 3,387	1,944		5,617
Ending balance	352,637	337,536	352,637		337,536
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance	1,302	(1,706)	(544)		(3,885)
Other comprehensive income (loss) before reclassifications	(106)	465	1,329		2,588
Reclassified from AOCI		2,881	411		2,937
Other comprehensive income (loss), net	(106)	3,346	1,740		5,525
Ending balance	1,196	1,640	1,196		1,640
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(1,303)	(1,311)	(1,467)		(1,362)
Other comprehensive income (loss) before reclassifications	(1)	(2)	83		(36)
Reclassified from AOCI	41	43	121		128
Other comprehensive income (loss), net	40	41	204		92
Ending balance	(1,263)	(1,270)	(1,263)		(1,270)
AOCI Attributable to Parent [Member]
Beginning balance	(1)	(3,017)	(2,011)		(5,247)
Other comprehensive income (loss) before reclassifications	(107)	463	1,412		2,552
Reclassified from AOCI	41	2,924	532		3,065
Other comprehensive income (loss), net	(66)	3,387	1,944		5,617
Ending balance	$ (67)	$ 370	$ (67)		$ 370
[1] Derived from audited financial statements

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
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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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