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Note 5 - Equity (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed, Amount [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2021

  

2020

  

2021

  

2020

 

General and administrative

 $332  $329  $641  $664 

Research and development

  101   79   197   141 

Total stock-based compensation expense

 $433  $408  $838  $805