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Note 2 - Revenue Information (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three months ended March 31, 2018
 
Professional audio products
  $
4,933
 
Unified Communications end points
   
1,036
 
Video products
   
1,320
 
    $
7,289
 
   
Three months ended March 31, 2018
 
North and South America
  $
4,346
 
Asia (including Middle East) and Australia
   
2,038
 
Europe and Africa
   
906
 
    $
7,289