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Note 5 - Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Balance at December 31, 2021 and 2020	$ 701,769	$ 823,272
Balance at March 31, 2022 and 2021	689,742	788,711
AOCI Attributable to Parent [Member]
Balance at December 31, 2021 and 2020	2,668	(804)
Balance at March 31, 2022 and 2021	2,471	(875)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before reclassifications	$ (197)	$ (71)

X

- Definition

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

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