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Note 2 - Revenue Information - Revenue by Product Group (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue from Contract with Customer, Including Assessed Tax $ 6,971 $ 10,311 $ 14,260 $ 21,989
Americas [Member]        
Revenue from Contract with Customer, Including Assessed Tax 4,110   8,456  
Asia Middle East and Australia [Member]        
Revenue from Contract with Customer, Including Assessed Tax 1,861   3,899  
Europe and Africa [Member]        
Revenue from Contract with Customer, Including Assessed Tax 1,000   1,905  
Professional Audio Products [Member]        
Revenue from Contract with Customer, Including Assessed Tax 4,871   9,804  
Unified Communications End Points [Member]        
Revenue from Contract with Customer, Including Assessed Tax 977   2,013  
Video Products [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 1,123   $ 2,443