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Note G - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   
Three months ended March 31,
   
2019
 
2018
Research and
development
  $
433
     $
376
 
General and administrative
   
857
     
905
 
Total stock-based compensation expense    
1,290
     
1,281