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Note 2 - Revenue Information - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 5,992	$ 6,683	$ 18,717	$ 20,943
Americas [Member]
Revenue	3,235	4,082	10,488	12,538
Asia Middle East and Australia [Member]
Revenue	1,931	1,693	5,764	5,592
Europe and Africa [Member]
Revenue	826	908	2,465	2,813
Audio Conferencing [Member]
Revenue	2,920	3,433	8,520	10,686
Microphones [Member]
Revenue	2,189	2,124	6,525	6,689
Video Products [Member]
Revenue	$ 883	$ 1,126	$ 3,672	$ 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://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

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