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Note 2 - Summary of significant accounting policies: Accounts and notes receivable, net (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Details        
Accounts and Financing Receivable, Allowance for Credit Loss $ 534,562 $ 472,293 $ 303,311 $ 310,968
Provision For Credit Losses Of Accounts And Notes Receivable $ 77,399 $ 178,118 $ 16,394