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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Balance	$ 823,272	$ 1,016,410
Balance	788,711	998,896
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(804)	(236)
Pension benefits recognized in OCI	(71)	369
Balance	$ (875)	$ 133

X

- Definition

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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