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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, 2022	Mar. 31, 2021
Balance	$ 329,976	$ 315,513
Balance	333,234	318,630
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(7,851)	(5,044)
Reclassification adjustments		0
Current period benefit (charge)	(36)	(1,383)
Income tax charge (benefit)		0
Balance	(7,887)	(6,427)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(22,479)	(25,333)
Reclassification adjustments	546	660
Current period benefit (charge)	0	0
Income tax charge (benefit)	(123)	(148)
Balance	(22,056)	(24,821)
AOCI Attributable to Parent [Member]
Balance	(30,330)	(30,377)
Reclassification adjustments	546	660
Current period benefit (charge)	(36)	(1,383)
Income tax charge (benefit)	(123)	(148)
Balance	$ (29,943)	$ (31,248)

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