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Note 3 - Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March
3
1
,
20
1
8
   
December 31,
20
1
7
 
                 
Inventories consist of:
               
Finished products
   
     
15
 
Net inventory
  $
     
15