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Note 2 - Revenue Information - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 6,305	$ 7,289
Americas [Member]
Revenue	3,760	4,345
Asia Middle East and Australia [Member]
Revenue	1,864	2,038
Europe and Africa [Member]
Revenue	681	906
Audio Conferencing [Member]
Revenue	2,711	3,659
Microphones [Member]
Revenue	2,106	2,310
Video Products [Member]
Revenue	$ 1,488	$ 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://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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- Details

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- Details

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