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Note 2 - Revenue Information (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three months ended
June 30, 2018
   
Six months ended
June 30, 2018
 
Professional audio products
  $
4,871
    $
9,804
 
Unified Communications end points
   
977
     
2,013
 
Video products
   
1,123
     
2,443
 
    $
6,971
    $
14,260
 
   
Three months ended
June 30, 2018
   
Six months ended
June 30, 2018
 
North and South America
  $
4,110
    $
8,456
 
Asia (including Middle East) and Australia
   
1,861
     
3,899
 
Europe and Africa
   
1,000
     
1,905
 
    $
6,971
    $
14,260