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Note 4 - Significant Accounting Policies (Details Textual) € in Thousands, $ in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May 31, 2022 EUR (€) | Nov. 30, 2021 EUR (€) | Jun. 30, 2022 EUR (€) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 EUR (€) | Dec. 31, 2021 EUR (€)
Statement Line Items [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  | € (208,096) |  |  | € (147,081)
Proceeds from issue of ordinary shares |  | € 142,334 |  | $ 150,000 |  |
Amount raised from public offering. | € 39,700 |  |  |  |  |
Net proceeds from second public offering |  |  | 39,346 | $ 41,534 | € 1,500 |
Second public offering |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Net proceeds from second public offering | € 39,300 |  |  |  |  |
Committed equity facility with Berenberg |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Proceeds from issue of ordinary shares |  |  | € 122,000 |  |  |
Period over which shares are to be issued to Berenberg |  |  | 24 months | 24 months |  |
Limit on the number of shares that Company may decide to sell to Berenberg on any given day, percentage of trading volume |  |  | 20.00% | 20.00% |  |

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