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Note 2 - Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Operating Expenses

                

Research and development

 $229  $122  $693  $378 

General and administrative

  398   254   979   1,203 

Total

 $627  $376  $1,672  $1,581