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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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Balance	$ 890,000	$ 1,115,539	$ 1,016,410	$ 1,144,923
Balance	853,577	1,077,764	853,577	1,077,764
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	581	2,194	(236)	2,194
Pension benefits recognized in AOCI	525	0	1,342	0
Balance	$ 1,106	$ 2,194	$ 1,106	$ 2,194

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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