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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	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Balances December 31, 2022	$ 331,194	$ 329,976
Balances March 31, 2023	341,359	327,370
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances December 31, 2022	(10,619)	(7,851)
Reclassification adjustments	0	0
Current period benefit (charge)	278	(2,864)
Income tax benefit (charge)	0	0
Balances March 31, 2023	(10,341)	(10,715)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balances December 31, 2022	(617)	0
Reclassification adjustments	(588)	0
Current period benefit (charge)	2,023	0
Income tax benefit (charge)	(341)	0
Balances March 31, 2023	477	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances December 31, 2022	(13,238)	(22,479)
Reclassification adjustments	583	2,716
Current period benefit (charge)	(72)	0
Income tax benefit (charge)	(145)	(630)
Balances March 31, 2023	(12,872)	(20,393)
AOCI Attributable to Parent [Member]
Balances December 31, 2022	(24,474)	(30,330)
Reclassification adjustments	(5)	2,716
Current period benefit (charge)	2,229	(2,864)
Income tax benefit (charge)	(486)	(630)
Balances March 31, 2023	$ (22,736)	$ (31,108)

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