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Note 5 - Inventories, Net (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    December 31,
2018
  December 31,
2017
Finished goods   $
544
    $
340
 
Raw materials    
1,274
     
829
 
Reserve    
(10
)    
(59
)
Inventories, net   $
1,808
    $
1,110