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Note 2 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

 
  

March 31,

 
  

2022

  

2021

 

Operating Expenses

        

Research and development

 $233  $219 

General and administrative

  387   286 

Total

 $620  $505