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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	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Balances	$ 331,194	$ 329,976
Balances	346,780	326,976
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances	(10,619)	(7,851)
Reclassification adjustments	0	0
Current period benefit (charge)	(888)	(5,719)
Income tax benefit (charge)	0	0
Balances	(11,507)	(13,570)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balances	(617)	0
Reclassification adjustments	(1,096)	0
Current period benefit (charge)	4,154	0
Income tax benefit (charge)	(726)	0
Balances	1,715	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(13,238)	(22,479)
Reclassification adjustments	874	7,945
Current period benefit (charge)	(68)	0
Income tax benefit (charge)	(214)	(1,878)
Balances	(12,646)	(16,412)
AOCI Attributable to Parent [Member]
Balances	(24,474)	(30,330)
Reclassification adjustments	(222)	7,945
Current period benefit (charge)	3,198	(5,719)
Income tax benefit (charge)	(940)	(1,878)
Balances	$ (22,438)	$ (29,982)

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