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Note 3 - Accounts and notes receivable, net: Summary of accounts and notes receivable (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Details |  |  |  |
Accounts receivable | $ 2,605,556 | $ 3,960,409 |  |
Notes receivable | 322,908 | 86,623 |  |
Allowance for credit losses | (534,562) | (472,293) | $ (303,311) | $ (310,968)
Total accounts and notes receivable, net | $ 2,393,902 | $ 3,574,739 |  |

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- Definition Amount of allowance for credit loss of accounts and financing receivables. Includes, but is not limited to, notes and loan receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-4 + Details
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- Definition Amount, after allowance for credit loss, of accounts and financing receivables, classified as current. Includes, but is not limited to, notes and loan receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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