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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	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Balance	$ 315,513	$ 307,878
Balance	324,956	313,324
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,044)	(8,155)
Reclassification adjustments	0	0
Current period benefit (charge)	(422)	(1,247)
Income tax charge (benefit)	0	0
Balance	(5,466)	(9,402)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(25,333)	(20,382)
Reclassification adjustments	3,077	4,669
Current period benefit (charge)	0	0
Income tax charge (benefit)	(714)	(1,078)
Balance	(22,970)	(16,791)
AOCI Attributable to Parent [Member]
Balance	(30,377)	(28,537)
Reclassification adjustments	3,077	4,669
Current period benefit (charge)	(422)	(1,247)
Income tax charge (benefit)	(714)	(1,078)
Balance	$ (28,436)	$ (26,193)

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