Note 4 - Other receivables and other current assets, net: Summary of other receivables and other current assets (Details) - USD ($) |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|---|---|
| Details | ||||
| Due from third parties | $ 478,537 | $ 370,262 | ||
| Deductible value-added tax | 172,260 | 385,494 | ||
| Refundable deposits | 14,760 | 30,543 | ||
| Allowance for credit losses | (320,155) | (278,776) | $ (252,947) | $ (239,594) |
| Total other receivables and other current assets, net | $ 345,402 | $ 507,523 |