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Note 2 - Revenue Information (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three months
ended
March 31,
2019
   
Three months
ended
March 31,
2018
 
Audio Conferencing
  $
2,711
    $
3,659
 
Microphones
   
2,106
     
2,310
 
Video products
   
1,488
     
1,320
 
    $
6,305
    $
7,289
 
   
Three months
ended
March 31,
2019
   
Three months
ended
March 31,
2018
 
North and South America
  $
3,760
    $
4,345
 
Asia (including Middle East) and Australia
   
1,864
     
2,038
 
Europe and Africa
   
681
     
906
 
    $
6,305
    $
7,289