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Note 5 - Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

As of March 31,

   

As of December 31,

 

(in thousands)

 

2022

   

2021

 

Raw materials

    1,299       1,316  

Work-in-process

    —       19  

Total inventories

  $ 1,299     $ 1,335