Note 5 - Share-based Compensation - Expenses for Continuing Operations 2 (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Share-based compensation expense | $ 47,652 | $ 31,660 | $ 131,048 | $ 105,985 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||
| Share-based compensation expense | 7,459 | 6,740 | 22,863 | 18,519 |
| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||||
| Share-based compensation expense | $ 40,193 | $ 24,920 | $ 108,185 | $ 87,466 |