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Note 5 - Inventory (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30, 2021

   

December 31, 2020

 
                 

Finished goods

  $ 219     $ 2  

Work in process

    26       247  

Raw materials

    88       842  

Total inventory

  $ 333     $ 1,091