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Note 7 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Loss Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance	$ 293,132	$ 325,495	$ 302,888
Reclassification of stranded income tax effects in accumulated other comprehensive income
Balance	307,878	293,132	325,495
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(8,243)	(5,321)	(8,842)
Reclassification adjustments
Current period benefit (charge)	88	(2,922)	3,521
Income tax charge
Reclassification of stranded income tax effects in accumulated other comprehensive income
Reclassification adjustments
Income tax benefit
Balance	(8,155)	(8,243)	(5,321)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(15,180)	(7,188)	(11,623)
Reclassification adjustments	1,753	4,016	5,124
Current period benefit (charge)	(8,521)	(9,644)	1,479
Income tax charge	1,566	(294)	(2,168)
Reclassification of stranded income tax effects in accumulated other comprehensive income		(2,070)
Reclassification adjustments	1,753	4,016	5,124
Income tax benefit	1,566	(294)	(2,168)
Balance	(20,382)	(15,180)	(7,188)
AOCI Attributable to Parent [Member]
Balance	(23,423)	(12,509)	(20,465)
Reclassification adjustments	1,753	4,016	5,124
Current period benefit (charge)	(8,433)	(12,566)	5,000
Income tax charge	1,566	(294)	(2,168)
Reclassification of stranded income tax effects in accumulated other comprehensive income		(2,070)
Reclassification adjustments	1,753	4,016	5,124
Income tax benefit	1,566	(294)	(2,168)
Balance	$ (28,537)	$ (23,423)	$ (12,509)

X

- Definition

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

+ References

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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

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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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