Note 5 - Share-based Compensation - Expenses for Continuing Operations 2 (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-based compensation expense | $ 42,652 | $ 21,837 | $ 83,396 | $ 74,325 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||
| Share-based compensation expense | 7,674 | 4,054 | 15,404 | 13,214 |
| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||||
| Share-based compensation expense | $ 34,978 | $ 17,783 | $ 67,992 | $ 61,111 |