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

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Operating Expenses

                

Research and development

 $245  $135  $463  $256 

General and administrative

  295   353   582   949 

Total

 $540  $488  $1,045  $1,205