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Note 10 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Balance beginning of period	$ 461,215
Balance at end of period	487,676
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance beginning of period	(5,234)	$ (10,753)
Other comprehensive income (loss) before reclassifications	2,393	1,185
Amounts reclassified from accumulated other comprehensive loss
Net current-period other comprehensive income (loss)	2,393	1,185
Balance at end of period	$ (2,841)	$ (9,568)

X

- Definition

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

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

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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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