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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, 2023	Mar. 31, 2022
Balances December 31, 2022	$ 331,194	$ 329,976
Balances March 31, 2023	331,440	333,234
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances December 31, 2022	(10,619)	(7,851)
Reclassification adjustments	0	0
Current period benefit (charge)	254	(36)
Income tax benefit (charge)	0	0
Balances March 31, 2023	(10,365)	(7,887)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balances December 31, 2022	(617)	0
Reclassification adjustments	(191)	0
Current period benefit (charge)	(1,819)	0
Income tax benefit (charge)	478	0
Balances March 31, 2023	(2,149)	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances December 31, 2022	(13,238)	(22,479)
Reclassification adjustments	291	546
Current period benefit (charge)	(85)	0
Income tax benefit (charge)	(72)	(123)
Balances March 31, 2023	(13,104)	(22,056)
AOCI Attributable to Parent [Member]
Balances December 31, 2022	(24,474)	(30,330)
Reclassification adjustments	100	546
Current period benefit (charge)	(1,650)	(36)
Income tax benefit (charge)	406	(123)
Balances March 31, 2023	$ (25,618)	$ (29,943)

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