Note 4 - Summary of Significant Accounting Policies - Exchange Rates Used to Translate Amounts in RMB into US (Details) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Balance sheet items, except for equity accounts | 6.8109 | 6.8109 | 7.0288 | ||
| Items in the statements of operations and comprehensive loss | 6.8408 | 7.1915 | 6.8932 | 7.1839 | |