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Note 10 - Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance at December 31	$ 823,272	$ 1,016,410	$ 1,144,923
Balance at December 31	701,769	823,272	1,016,410
AOCI Attributable to Parent [Member]
Balance at December 31	(804)	(236)	2,194
Balance at December 31	2,668	(804)	(236)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before reclassifications	$ 3,472	$ (568)	$ (2,430)

X

- Definition

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

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