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Cash and cash equivalents (Details) - EUR (€)
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Statement [Line Items]        
Short-term deposits € 3,514 € 12,584,892    
Total Cash at banks 15,412,638 13,665,102    
Total cash and cash equivalents 15,416,152 26,249,995 € 72,360,428 € 25,968,681
U.S. Dollars        
Statement [Line Items]        
Short-term deposits 3,514 12,584,892    
Total Cash at banks 13,336,087 7,612,467    
Euro        
Statement [Line Items]        
Total Cash at banks € 2,076,551 € 6,052,636