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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, 2018	Sep. 30, 2017
Balance	$ 325,495
Balance	347,739
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,321)	$ (8,842)
Reclassification adjustments
Current period charge	(1,549)	3,119
Income tax expense
Balance	(6,870)	(5,723)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(7,188)	(11,623)
Reclassification adjustments	3,632	4,720
Current period charge		54
Income tax expense	(893)	(1,746)
Balance	(4,449)	(8,595)
AOCI Attributable to Parent [Member]
Balance	(12,509)	(20,465)
Reclassification adjustments	3,632	4,720
Current period charge	(1,549)	3,173
Income tax expense	(893)	(1,746)
Balance	$ (11,319)	$ (14,318)

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

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