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Note 6 - Stock-based Compensation Expense (Tables)
6 Months Ended
Jun. 30, 2026
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

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