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Note 8 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Loss Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Balance	$ 307,878	$ 293,132
Balance	308,348	296,947
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(8,155)	(8,243)
Reclassification adjustments
Current period benefit (charge)	(2,361)	(185)
Income tax benefit (charge)		33
Balance	(10,516)	(8,395)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(20,382)	(15,180)
Reclassification adjustments	2,068	398
Current period benefit (charge)
Income tax benefit (charge)	(489)	(82)
Balance	(18,803)	(14,864)
AOCI Attributable to Parent [Member]
Balance	(28,537)	(23,423)
Reclassification adjustments	2,068	398
Current period benefit (charge)	(2,361)	(185)
Income tax benefit (charge)	(489)	(49)
Balance	$ (29,319)	$ (23,259)

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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