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Note 2 - Revenue Information - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 6,683	$ 10,560	$ 20,943	$ 32,549
Americas [Member]
Revenue from Contract with Customer, Including Assessed Tax	4,082		12,538
Asia Middle East and Australia [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,693		5,592
Europe and Africa [Member]
Revenue from Contract with Customer, Including Assessed Tax	908		2,813
Professional Audio Products [Member]
Revenue from Contract with Customer, Including Assessed Tax	4,781		14,586
Unified Communications End Points [Member]
Revenue from Contract with Customer, Including Assessed Tax	776		2,789
Video Products [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 1,126		$ 3,568

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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