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Note 8 - Geographic Information and Major Customer Data - Revenues Based on Customer Location (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019		Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018
Revenues	$ 18,400		$ 17,494	$ 35,369		$ 35,063
UNITED STATES
Revenues	2,123		2,121	3,902		3,828
Europe and Middle East [Member]
Revenues	2,992		2,713	6,334		5,166
Asia Pacific [Member]
Revenues	13,285		12,660	25,133		26,069
GERMANY
Revenues	2,599		1,895	5,188			[1]
CHINA
Revenues	9,306		6,802	16,549		12,935
KOREA, REPUBLIC OF
Revenues		[1]	2,877		[1]	5,679
JAPAN
Revenues	$ 2,188		$ 2,523	$ 4,835		$ 5,147
[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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