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Note 2 - Summary of significant accounting policies: Revenue recognition (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Details |  |  |
Revenue, Performance Obligation, Description of Payment Terms | The payment terms usually include, but are not limited to, the following billing stages: 1) signing of the sales contract, approximately between 20% - 40% of the contract price, 2) before delivery 30% - 40%, 3) completion of the delivery or instalment, approximately between 10% - 30% of the contract price, and 4) completion of a warranty period, approximately within 10% of the contract price. The completion of a warranty period is only passage of time and would not make the Company probable to not able to bill the remaining approximately 10% of the contract price. The timing of receiving payments does not differ significantly from the payment terms specified in the contracts. |  |
Contract with Customer, Liability, Revenue Recognized | $ 3,804,266 | $ 1,753,808 | $ 1,629,501

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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- Definition Description of payment terms in contract with customer. Includes, but is not limited to, timing of payment, existence of financing component, variability of consideration and constraint on variable consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 + Details
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