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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
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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

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- 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 + Details
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