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Note 3 - Correction of Immaterial Error in Previously Issued Financial Statements (Details) - EUR (€)
€ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Correction of Immaterial Error in Previously Issued Financial Statements, Disclosure [Line Items]            
Cost of research and development € (30,402) € (10,432) € (53,142) € (12,825)    
Property, plant and equipment 25,359 € 980 25,359 980 € 1,484 € 2,102
IPO related cost recognized in equity     842 € 17    
Increase (decrease) due to corrections of prior period errors            
Correction of Immaterial Error in Previously Issued Financial Statements, Disclosure [Line Items]            
Cost of research and development     (650)      
Property, plant and equipment € 650   650      
IPO related cost recognized in equity     € 595