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Note 4 - Inventories, Net (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

March 31,

   

December 31,

 
   

2022

   

2021

 

Finished goods

  $ 971     $ 1,027  

Work in process

    -       2  

Raw materials

    899       537  

Inventories, net

  $ 1,870     $ 1,566