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v3.25.2

Summary of significant accounting policies (Details Narrative) |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 20, 2025 shares | Jun. 30, 2025 EUR (€) Integer shares | Dec. 31, 2024 EUR (€) shares | Jun. 30, 2024 EUR (€) shares | Dec. 31, 2023 EUR (€) shares | Jun. 30, 2025 $ / shares | Jun. 30, 2025 EUR (€) shares | Jan. 01, 2024 shares
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net loss | € |  | € 3,826,585 | € 4,873,989 | € 4,038,506 |  |  |  |
Comprehensive loss | € |  | 3,782,987 |  | € 4,118,875 |  |  |  |
Common stock, shares issued |  |  | 18,289,866 | 18,289,866 | 18,216,958 |  | 19,146,468 |
Common stock, shares outstanding | 19,146,468 |  | 18,289,866 | 18,289,866 | 18,216,958 |  | 19,146,468 |
Common stock, capital shares reserved for future issuance |  |  | 900,000 | 1,800,000 | 1,800,000 |  | 400,000 |
Stock issued during period, shares, new issues | 856,602 |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, outstanding, number |  |  | 970,308 |  | 586,923 |  | 1,465,815 | 586,923
Foreign exchange net loss | € |  | € (602,873) |  | € 153,791 |  |  |  |
Number of operating segments | Integer |  | 1 |  |  |  |  |  |
Effective income tax rate reconciliation, tax credit, research, amount | € |  | € 3,300,000 |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, expiration period |  | 10 years |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant |  |  | 858,678 |  |  |  | 448,831 | 1,234,772
ATM Offering Costs [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Offering costs | € |  |  |  | 200,000 |  |  | € 12,918 |
Common Stock [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net loss | € |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  | 856,602 |  | 72,908 |  |  |  |
Number of outstanding common shares |  |  | 18,289,866 | 18,289,866 | 18,216,958 |  | 19,146,468 |
Maximum [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate reconciliation, tax credit, research, amount | € |  |  |  |  | € 5,000,000.0 |  |  |
Maximum [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, number of shares, period increase (decrease) |  | 2,700,000 |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant |  |  |  |  |  |  | 2,700,000 |
Number of outstanding common shares |  |  |  |  |  |  | 27,000,000 |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, outstanding, number |  |  |  | 280,033 |  |  | 1,465,815 |
Share-Based Payment Arrangement, Option [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, outstanding, number |  |  |  |  |  |  | 19,146,468 |
Share-based compensation arrangement by share-based payment award, number of shares authorized |  |  |  |  |  |  | 1,914,646 |
Share-based compensation arrangement by share-based payment award, percentage |  | 10.00% |  |  |  |  |  |
Underswriters Common Share Warrants [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, outstanding, number |  |  |  |  |  |  | 23,502 |
Underswriters Warrants [Member] | IPO [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  | 23,502 |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights | $ / shares |  |  |  |  |  | $ 14.375 |  |
Equity Incentive Plan 2021 - 2025 [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Common stock, capital shares reserved for future issuance |  |  | 1,800,000 |  |  |  |  |

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