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

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2023

  

2022

  

2023

  

2022

 

Operating Expenses

                

Research and development

 $337  $187  $601  $420 

General and administrative

  424   538   848   925 

Total

 $761  $725  $1,449  $1,345