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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, 2022	Jun. 30, 2021
Balances	$ 329,976	$ 315,513
Balances	327,370	324,956
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances	(7,851)	(5,044)
Reclassification adjustments	0	0
Current period benefit (charge)	(2,864)	(422)
Income tax charge (benefit)	0	0
Balances	(10,715)	(5,466)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(22,479)	(25,333)
Reclassification adjustments	2,716	3,077
Current period benefit (charge)	0	0
Income tax charge (benefit)	(630)	(714)
Balances	(20,393)	(22,970)
AOCI Attributable to Parent [Member]
Balances	(30,330)	(30,377)
Reclassification adjustments	2,716	3,077
Current period benefit (charge)	(2,864)	(422)
Income tax charge (benefit)	(630)	(714)
Balances	$ (31,108)	$ (28,436)

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