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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	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Balances	$ 349,459	$ 331,194
Balances	358,559	341,359
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances	(9,688)	(10,619)
Reclassification adjustments	0	0
Current period benefit (charge)	(1,189)	278
Income tax benefit (charge)	0	0
Balances	(10,877)	(10,341)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balances	(1,069)	(617)
Reclassification adjustments	(1,037)	(588)
Current period benefit (charge)	3,452	2,023
Income tax benefit (charge)	(573)	(341)
Balances	773	477
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(14,180)	(13,238)
Reclassification adjustments	(108)	583
Current period benefit (charge)	242	(72)
Income tax benefit (charge)	(161)	(145)
Balances	(14,207)	(12,872)
AOCI Attributable to Parent [Member]
Balances	(24,937)	(24,474)
Reclassification adjustments	(1,145)	(5)
Current period benefit (charge)	2,505	2,229
Income tax benefit (charge)	(734)	(486)
Balances	$ (24,311)	$ (22,736)

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