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v3.25.2

Nature of business and history (Details Narrative) |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 20, 2024 USD ($) shares | Dec. 20, 2024 EUR (€) shares | Apr. 26, 2024 USD ($) | Mar. 31, 2025 USD ($) shares | Mar. 31, 2025 EUR (€) shares | May 31, 2023 EUR (€) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 EUR (€) | Dec. 31, 2024 EUR (€) | Jun. 30, 2024 EUR (€) | Dec. 31, 2023 EUR (€)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance or sale of equity |  |  |  |  |  |  |  | € 2,977,061 |  | € 270,885 |
Sale of stock, value |  |  |  |  |  | € 30,000,000.0 |  |  |  |  |
Stock issued during period, value, new issues |  |  |  |  |  |  |  | 2,977,061 |  | 270,885 |
Net loss |  |  |  |  |  |  |  | 3,826,585 | € 4,873,989 | € 4,038,506 |
Accumulated deficit |  |  |  |  |  |  |  | 59,882,105 | € 56,055,520 |  |
Cash and cash equivalents and marketable securities |  |  |  |  |  |  |  | € 17,700,000 |  |  |
Shelf Registration Statement [Member] |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance or sale of equity |  |  |  |  |  |  |  |  |  |  | € 100,000,000
ATM Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, value, new issues | $ |  |  | $ 29,696,999 |  |  |  |  |  |  |  |
Common stock, shares outstanding | $ |  |  | $ 75,000,000.0 |  |  |  |  |  |  |  |
Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance or sale of equity | $ 303,001 | € 271,416 |  | $ 3,255,430 | € 2,977,061 |  |  |  |  |  |
Number of shares sold | shares | 73,008 | 73,008 |  | 856,602 | 856,602 |  |  |  |  |  |
Sale of stock value of share available to be sold | $ |  |  |  |  |  |  | $ 26,441,569 |  |  |  |
Sale of stock commission percentage | 3.00% | 3.00% |  |  |  |  |  |  |  |  |

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