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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

December 31,

 
   

2019

   

2018

 

Raw materials

  $ 18,593     $ 12,435  

Work in process

    19,081       13,602  

Finished goods

    17,339       7,015  
    $ 55,013     $ 33,052