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Note 8 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Balance	$ 325,495
Balance	332,548
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,321)	$ (8,842)
Reclassification adjustments
Current period credit	189	547
Income tax expense
Balance	(5,132)	(8,295)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(7,188)	(11,623)
Reclassification adjustments	681	2,002
Current period credit		14
Income tax expense	(171)	(740)
Balance	(6,678)	(10,347)
AOCI Attributable to Parent [Member]
Balance	(12,509)	(20,465)
Reclassification adjustments	681	2,002
Current period credit	189	561
Income tax expense	(171)	(740)
Balance	$ (11,810)	$ (18,642)

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

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