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Note 5 - Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

September 30,
2023

   

December 31,
2022

 

Equipment

  $ 5,158     $ 5,137  

Leasehold improvements

    1,612       1,612  

Software

    364       364  

Furniture and fixtures

    22       22  

Total property and equipment–at cost

    7,156       7,135  

Less: Accumulated depreciation

    (6,105 )     (5,568 )

Property and equipment, net

  $ 1,051     $ 1,567