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Note 4 - Property and Equipment, Net (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

September 30,

   

December 31,

 
   

2023

   

2022

 

Computer equipment and software

  $ 161     $ 161  

Laboratory and manufacturing equipment

    574       575  

Furniture and fixtures

    27       27  

Leasehold improvements

    26       26  

Property and equipment, gross

    788       789  

Less accumulated depreciation

    (674 )     (619 )

Property and equipment, net

  $ 114     $ 170