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NOTE 3 - PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Property, plant, and equipment, net
    June 30,2019     December 31,2018  
 (in thousands)            
 Leasehold improvements   $ 399     $ 399  
 Equipment     5,569       5,378  
 Sales demonstration equipment     1,068       942  
      7,036       6,719  
 Less accumulated depreciation     5,083       4,734  
 Property and equipment, net   $ 1,953     $ 1,985