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Note 8 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Balance	$ 293,132	$ 325,495
Balance	310,312	347,739
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(8,243)	(5,321)
Reclassification adjustments
Current period benefit	(1,180)	(1,549)
Income tax benefit (charge)
Balance	(9,423)	(6,870)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(15,180)	(7,188)
Reclassification adjustments	1,315	3,632
Current period benefit
Income tax benefit (charge)	(281)	(893)
Balance	(14,146)	(4,449)
AOCI Attributable to Parent [Member]
Balance	(23,423)	(12,509)
Reclassification adjustments	1,315	3,632
Current period benefit	(1,180)	(1,549)
Income tax benefit (charge)	(281)	(893)
Balance	$ (23,569)	$ (11,319)

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Amount of current period charge (benefit) before tax of other comprehensive income (loss) attributable to parent entity.

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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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