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Note 5 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss as Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance	$ 302,888	$ 287,021	$ 281,967
Balance	325,495	302,888	287,021
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(8,842)	(9,057)	(4,338)
Reclassification adjustments
Current period benefit (charge)	3,521	215	(4,719)
Income tax benefit
Balance	(5,321)	(8,842)	(9,057)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(11,623)	(13,358)	(12,988)
Reclassification adjustments	5,124	1,402	5,364
Current period benefit (charge)	1,479	1,357	(6,038)
Income tax benefit	(2,168)	(1,024)	304
Balance	(7,188)	(11,623)	(13,358)
AOCI Attributable to Parent [Member]
Balance	(20,465)	(22,415)	(17,326)
Reclassification adjustments	5,124	1,402	5,364
Current period benefit (charge)	5,000	1,572	(10,757)
Income tax benefit	(2,168)	(1,024)	304
Balance	$ (12,509)	$ (20,465)	$ (22,415)

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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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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