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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance	$ 788,711	$ 998,896	$ 823,272	$ 1,016,410
Balance	759,738	890,000	759,738	890,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(875)	133	(804)	(236)
Pension benefits recognized in OCI	(207)	448	(278)	817
Balance	$ (1,082)	$ 581	$ (1,082)	$ 581

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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