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Note 4 - Property and Equipment, Net (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

March 31,

   

December 31,

 
   

2024

   

2023

 

Computer equipment and software

  $ 161     $ 161  

Laboratory and manufacturing equipment

    574       574  

Furniture and fixtures

    27       27  

Leasehold improvements

    26       26  

Property and equipment, gross

    788       788  

Less accumulated depreciation

    (713 )     (694 )

Property and equipment, net

  $ 75     $ 94