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NOTE 3 - PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Property, plant, and equipment, net
   June 30,
2020
  December 31,
2019
(in thousands)          
Leasehold improvements  $390   $395 
Equipment   5,666    5,606 
Sales demonstration equipment       905    778 
    6,961    6,779 
Less accumulated depreciation   5,359    5,111 
Property and equipment, net  $1,602   $1,668