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Note 7 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Loss Reported in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Balances	$ 349,459	$ 331,194
Balances	353,683	331,440
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances	(9,688)	(10,619)
Reclassification adjustments	0	0
Current period benefit (charge)	(1,084)	254
Income tax benefit (charge)	0	0
Balances	(10,772)	(10,365)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balances	(1,069)	(617)
Reclassification adjustments	(525)	(191)
Current period benefit (charge)	2,634	(1,819)
Income tax benefit (charge)	(500)	478
Balances	540	(2,149)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(14,180)	(13,238)
Reclassification adjustments	(431)	291
Current period benefit (charge)	236	(85)
Income tax benefit (charge)	(82)	(72)
Balances	(14,457)	(13,104)
AOCI Attributable to Parent [Member]
Balances	(24,937)	(24,474)
Reclassification adjustments	(956)	100
Current period benefit (charge)	1,786	(1,650)
Income tax benefit (charge)	(582)	406
Balances	$ (24,689)	$ (25,618)

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