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Note 2 - Basis of Presentation (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Cost of Goods and Services Sold, Total	$ 55,105	$ 60,731	[1]	$ 178,578	$ 169,488	[1]
Selling and Marketing Expense, Total	8,412	7,384	[1]	24,629	22,051	[1]
General and Administrative Expense, Total	$ 4,120	3,381	[1]	$ 12,906	10,124	[1]
Classification of Expenses Error [Member] | Restatement Adjustment [Member]
Cost of Goods and Services Sold, Total		(300)			(300)
Selling and Marketing Expense, Total		(200)			(200)
General and Administrative Expense, Total		$ 500			$ 500
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.

X

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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+ References

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