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Note 2 - Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2023

  

2022

  

2023

  

2022

 

Operating Expenses

                

Research and development

 $(121) $256  $480  $676 

General and administrative

  413   383   1,261   1,308 

Total

 $292  $639  $1,741  $1,984