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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    March 31,
2019
  December 31,
2018
Finished goods   $
433
    $
544
 
Raw materials    
1,363
     
1,274
 
Reserve    
(105
)    
(10
)
Inventories, net   $
1,691
    $
1,808