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Note 6 - Stock-based Compensation Expense
 6 Months Ended
Jun. 30, 2026
Notes to Financial Statements  
Share-Based Payment Arrangement [Text Block]

6.

Stock-Based Compensation Expense

 

Stock-based compensation expense related to stock options and restricted stock awards is recognized on a straight-line basis over the requisite service period for the award and is allocated to research and development expense or general and administrative expense based upon the classification of the individual to whom the award is granted.

 

The following table summarizes total stock-based compensation expense included in operating expenses for the periods presented:

 

   

Three Months Ended June 30,

    

Six Months Ended June 30,

  
   

2026

    

2025

    

2026

    

2025

  

Research and development expense

   $ 107,671     $ 130,323     $ 215,848     $ 260,639  

General and administrative expense

     56,075       162,417       167,215       324,845  

Total

   $ 163,746     $ 292,740     $ 383,063     $ 585,484  

 

As of June 30, 2026, there is approximately $1.3 million of unrecognized stock-based compensation expense that we expect to recognize over a weighted-average period of 1.7 years.