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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	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Balances	$ 349,459	$ 331,194
Balances	367,334	346,780
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances	(9,688)	(10,619)
Reclassification adjustments	0	0
Current period benefit (charge)	677	(888)
Income tax benefit (charge)	0	0
Balances	(9,011)	(11,507)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balances	(1,069)	(617)
Reclassification adjustments	(1,540)	(1,096)
Current period benefit (charge)	528	4,154
Income tax benefit (charge)	242	(726)
Balances	(1,839)	1,715
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(14,180)	(13,238)
Reclassification adjustments	216	874
Current period benefit (charge)	251	(68)
Income tax benefit (charge)	(239)	(214)
Balances	(13,952)	(12,646)
AOCI Attributable to Parent [Member]
Balances	(24,937)	(24,474)
Reclassification adjustments	(1,324)	(222)
Current period benefit (charge)	1,456	3,198
Income tax benefit (charge)	3	(940)
Balances	$ (24,802)	$ (22,438)

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