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Note 4 - Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
2019
 
December 31,
2018
Finished goods   $
358
    $
544
 
Raw materials    
1,150
     
1,274
 
Reserve    
(393
)    
(10
)
Inventories, net   $
1,115
    $
1,808