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Note 10 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Beginning balance	$ 283,383	$ 269,626
Net current period other comprehensive income (loss)	(285)	61
Ending balance	286,998	272,337
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(1,487)
Other comprehensive income (loss) before reclassifications	20
Amounts reclassified from Accumulated other comprehensive loss	2
Net current period other comprehensive income (loss)	22
Ending balance	(1,465)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance	(195)
Other comprehensive income (loss) before reclassifications	(296)
Amounts reclassified from Accumulated other comprehensive loss	(11)
Net current period other comprehensive income (loss)	(307)
Ending balance	(502)
AOCI Attributable to Parent [Member]
Beginning balance	(1,682)	(1,866)
Other comprehensive income (loss) before reclassifications	(276)
Amounts reclassified from Accumulated other comprehensive loss	(9)
Net current period other comprehensive income (loss)	(285)
Ending balance	$ (1,967)	$ (1,805)

X

- Definition

Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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