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Note 14 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance	$ 379,833	$ 327,645	$ 265,539
Balance	461,215	379,833	327,645
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(10,753)	(5,212)	(2,929)
Other comprehensive income (loss) before reclassifications	5,519	(5,541)	(2,283)
Amounts reclassified from accumulated other comprehensive income (loss)
Net current-period other comprehensive income (loss)	5,519	(5,541)	(2,283)
Balance	$ (5,234)	$ (10,753)	$ (5,212)

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
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-URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581

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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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