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Note 4 - Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
   
December 31,
 
   
2019
   
2018
 
Raw materials
  $
    $
79
 
Work in process
   
     
39
 
Finished goods
   
5
     
23
 
Total
  $
5
    $
141