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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	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Balance	$ 315,513	$ 307,878
Balance	329,476	319,631
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,044)	(8,155)
Reclassification adjustments	0	0
Current period benefit (charge)	(1,849)	397
Income tax charge (benefit)	0	0
Balance	(6,893)	(7,758)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(25,333)	(20,382)
Reclassification adjustments	4,033	6,276
Current period benefit (charge)	0	0
Income tax charge (benefit)	(944)	(1,443)
Balance	(22,244)	(15,549)
AOCI Attributable to Parent [Member]
Balance	(30,377)	(28,537)
Reclassification adjustments	4,033	6,276
Current period benefit (charge)	(1,849)	397
Income tax charge (benefit)	(944)	(1,443)
Balance	$ (29,137)	$ (23,307)

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