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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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Balance	$ 325,495
Balance	339,567
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,321)	$ (8,842)
Reclassification adjustments
Current period credit	(1,666)	1,864
Income tax expense
Balance	(6,987)	(6,978)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(7,188)	(11,623)
Reclassification adjustments	3,227	4,005
Current period credit
Income tax expense	(796)	(1,449)
Balance	(4,757)	(9,067)
AOCI Attributable to Parent [Member]
Balance	(12,509)	(20,465)
Reclassification adjustments	3,227	4,005
Current period credit	(1,666)	1,864
Income tax expense	(796)	(1,449)
Balance	$ (11,744)	$ (16,045)

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

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