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Note 4 - Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
   
December 31,
 
   
2020
   
2019
 
Raw materials
  $
    $
 
Work in process
   
     
 
Finished goods
   
     
4
 
Total
  $
    $
4