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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	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Balances	$ 349,459	$ 331,194	$ 329,976
Balance at December 31, 2020	373,800	349,459	331,194
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balances	(9,688)	(10,619)	(7,851)
Reclassification adjustments	0	0	0
Reclassification adjustments	0	0	0
Current period benefit (charge)	3,024	(931)	(2,768)
Current period benefit (charge)	(3,024)	931	2,768
Income tax benefit	0	0	0
Income tax benefit	0	0	(0)
Balance at December 31, 2020	(12,712)	(9,688)	(10,619)
Reclassification adjustments	0	0	(0)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balances	(1,069)	(617)	0
Reclassification adjustments	1,791	1,630	(43)
Reclassification adjustments	1,791	1,630	(43)
Current period benefit (charge)	(3,058)	(1,039)	766
Current period benefit (charge)	3,058	1,039	(766)
Income tax benefit	301	(139)	(192)
Income tax benefit	(301)	139	192
Balance at December 31, 2020	(103)	(1,069)	(617)
Reclassification adjustments	(1,791)	(1,630)	43
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(14,180)	(13,238)	(22,479)
Reclassification adjustments	(1,424)	(1,423)	8,519
Reclassification adjustments	(1,424)	(1,423)	8,519
Current period benefit (charge)	(611)	2,667	3,610
Current period benefit (charge)	611	(2,667)	(3,610)
Income tax benefit	483	(302)	(2,888)
Income tax benefit	(483)	302	2,888
Balance at December 31, 2020	(12,628)	(14,180)	(13,238)
Reclassification adjustments	1,424	1,423	(8,519)
AOCI Attributable to Parent [Member]
Balances	(24,937)	(24,474)	(30,330)
Reclassification adjustments	367	207	8,476
Reclassification adjustments	367	207	8,476
Current period benefit (charge)	(645)	697	76
Current period benefit (charge)	645	(697)	(76)
Income tax benefit	784	(441)	(2,696)
Income tax benefit	(784)	441	2,696
Balance at December 31, 2020	(25,443)	(24,937)	(24,474)
Reclassification adjustments	$ (367)	$ (207)	$ (8,476)

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