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Note 11 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Balance	$ 1,360,199	$ 1,309,229	$ 1,268,037
Balance	1,412,783	1,360,199	1,309,229
AOCI Attributable to Parent [Member]
Balance	1,436	1,124	869
Foreign currency translation adjustment	(471)	312	255
Balance	$ 965	$ 1,436	$ 1,124

X

- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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