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Note 4 - Other receivables and other current assets, net: Summary of other receivables and other current assets (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Details        
Due from third parties $ 370,262 $ 452,544    
Deductible value-added tax 385,494 0    
Refundable deposits 30,543 16,054    
Allowance for credit losses (278,776) (252,947) $ (239,594) $ (264,880)
Total other receivables and other current assets, net $ 507,523 $ 215,651