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Note 2 - Revenue Information (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three months ended
September 30
, 2018
   
Nine months
ended
September 30
, 2018
 
Professional audio products
  $
4,781
    $
14,586
 
Unified Communications end points
   
776
     
2,789
 
Video products
   
1,126
     
3,568
 
    $
6,683
    $
20,943
 
   
Three months ended
September 30
, 2018
   
Nine months
ended
September 30
, 2018
 
North and South America
  $
4,082
    $
12,538
 
Asia (including Middle East) and Australia
   
1,693
     
5,592
 
Europe and Africa
   
908
     
2,813
 
    $
6,683
    $
20,943