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Note 12 - Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2023

  

2022

  

2023

  

2022

 

Options to purchase common stock

  20,593   13,751   17,743   12,736 

Series B convertible preferred stock

  165   165   165   165 

Warrants to purchase common stock

  21,515   21,515   21,515   21,931 
   42,273   35,431   39,423   34,832