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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, 2021	Mar. 31, 2020
Balance	$ 315,513	$ 307,878
Balance	318,630	308,348
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,044)	(8,155)
Reclassification adjustments	0	0
Current period benefit (charge)	(1,383)	(2,361)
Income tax charge (benefit)	0	0
Balance	(6,427)	(10,516)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(25,333)	(20,382)
Reclassification adjustments	660	2,068
Current period benefit (charge)	0	0
Income tax charge (benefit)	(148)	(489)
Balance	(24,821)	(18,803)
AOCI Attributable to Parent [Member]
Balance	(30,377)	(28,537)
Reclassification adjustments	660	2,068
Current period benefit (charge)	(1,383)	(2,361)
Income tax charge (benefit)	(148)	(489)
Balance	$ (31,248)	$ (29,319)

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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