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Note 2 - Revenue Information - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 7,289	$ 11,678
Americas [Member]
Revenue from Contract with Customer, Including Assessed Tax	4,346
Asia Middle East and Australia [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,038
Europe and Africa [Member]
Revenue from Contract with Customer, Including Assessed Tax	906
Professional Audio Products [Member]
Revenue from Contract with Customer, Including Assessed Tax	4,933
Unified Communications End Points [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,036
Video Products [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 1,320

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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