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 |