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Note 10 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Balance	$ 342,614	$ 321,077	$ 340,360	$ 318,274
Net current period other comprehensive income (loss)	(13)	(8)	42	(135)
Balance	351,183	328,601	351,183	328,601
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance			(1,193)	(1,532)
Other comprehensive income before reclassifications			38	53
Amounts reclassified from Accumulated other comprehensive loss			6	6
Net current period other comprehensive income (loss)			44	59
Balance	(1,149)	(1,473)	(1,149)	(1,473)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Foreign Exchange Forward [Member]
Balance			(13)	94
Other comprehensive income before reclassifications			11	(109)
Amounts reclassified from Accumulated other comprehensive loss			2	8
Net current period other comprehensive income (loss)			13	(101)
Balance	0	(7)	0	(7)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Interest Rate Swap [Member]
Balance			246	649
Other comprehensive income before reclassifications			134	173
Amounts reclassified from Accumulated other comprehensive loss			(149)	(266)
Net current period other comprehensive income (loss)			(15)	(93)
Balance	231	556	231	556
AOCI Attributable to Parent [Member]
Balance	(905)	(916)	(960)	(789)
Other comprehensive income before reclassifications			183	117
Amounts reclassified from Accumulated other comprehensive loss			(141)	(252)
Net current period other comprehensive income (loss)			42	(135)
Balance	$ (918)	$ (924)	$ (918)	$ (924)

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