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Note 9 - Convertible Notes Payable at Fair Value - Summary of Valuation Assumption (Details) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Euro Member Countries, Euro |  |
Foreign exchange rate at year end USD/EUR | 1.0389 | 1.105
Measurement Input, Share Price [Member] |  |
Debt Instrument, Measurement Input | 4.18 | 5.92
Measurement Input, Exercise Price [Member] |  |
Debt Instrument, Measurement Input | 1.75 | 1.64
Measurement Input, Price Volatility [Member] |  |
Debt Instrument, Measurement Input | 1.50 | 1.50
Measurement Input, Expected Term [Member] |  |
Debt Instrument, Measurement Input | 1 | 1
Measurement Input, Risk Free Interest Rate [Member] |  |
Debt Instrument, Measurement Input | 0.0418 | 0.042

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