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Note G - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three months ended September 30,

  

Nine months ended September 30,

 
  

2022

  

2021

  

2022

  

2021

 

Research and development

 $360  $201  $1,093  $630 

General and administrative

  551   419   2,246   983 

Total stock-based compensation expense

 $911  $620  $3,339  $1,613