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Note 2 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

 
  

March 31,

 
  

2023

  

2022

 

Operating Expenses

        

Research and development

 $265  $233 

General and administrative

  423   387 

Total

 $688  $620