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Note G - Stock-based Compensation (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

 

Research and development

 $311  $296 

General and administrative

  607   379 

Total stock-based compensation expense

 $918  $675