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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies - Revenue by Product Group (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 28,156	$ 41,804
Americas [Member]
Revenue from Contract with Customer, Including Assessed Tax	16,534	26,310
Asia Middle East and Australia [Member]
Revenue from Contract with Customer, Including Assessed Tax	7,924	11,087
Europe and Africa [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,698	4,407
Audio Conferencing [Member]
Revenue from Contract with Customer, Including Assessed Tax	13,946	21,078
Microphones [Member]
Revenue from Contract with Customer, Including Assessed Tax	9,012	13,430
Video Products [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 5,198	$ 7,296

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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