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Note 4 - Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
2018
   
December 31,
2017
 
Raw materials
  $
63
    $
70
 
Work in process
   
29
     
92
 
Finished goods
   
44
     
29
 
Total
  $
136
    $
191