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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,
2019		   December 31,
2018
Finished goods   $
155
     $
544
  
Raw materials    
1,123
      
1,274
  
Reserve    
(128
 )    
(10
 )
Inventories, net   $
1,150
     $
1,808