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Note 8 - Geographic Information and Major Customer Data - Revenues Based on Customer Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 16,969	$ 17,569
UNITED STATES
Revenues	1,779	1,707
Europe and Middle East [Member]
Revenues	3,342	2,453
Asia Pacific [Member]
Revenues	11,848	13,409
GERMANY
Revenues	2,589		[1]
CHINA
Revenues	7,243	6,152
KOREA, REPUBLIC OF
Revenues	1,767	2,802
JAPAN
Revenues	$ 2,647	$ 2,624
[1] Less than 10%

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

+ Details

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Period Type:	duration

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- Details

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- Details

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- Details

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- Details

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