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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, 2022	Sep. 30, 2021
Balances	$ 329,976	$ 315,513
Balances	326,976	329,476
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances	(7,851)	(5,044)
Reclassification adjustments	0	0
Current period benefit (charge)	(5,719)	(1,849)
Income tax charge (benefit)	0	0
Balances		(6,893)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(22,479)	(25,333)
Reclassification adjustments	7,945	4,033
Current period benefit (charge)	0	0
Income tax charge (benefit)	(1,878)	(944)
Balances		(22,244)
AOCI Attributable to Parent [Member]
Balances	(30,330)	(30,377)
Reclassification adjustments	7,945	4,033
Current period benefit (charge)	(5,719)	(1,849)
Income tax charge (benefit)	(1,878)	(944)
Balances	$ (29,982)	$ (29,137)

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