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Note 6 - Stock-Based Compensation Expense - Schedule of Stock-Based Compensation Expense 2 (Details) - Share-Based Payment Arrangement, Option [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Total stock-based compensation expense $ 163,746 $ 292,740 $ 383,063 $ 585,484
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense        
Total stock-based compensation expense 56,075 162,417 167,215 324,845
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense        
Total stock-based compensation expense $ 107,671 $ 130,323 $ 215,848 $ 260,639