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Note 6 - Disclosures to the interim condensed consolidated statements of income or loss (Details Textual)
€ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2022
EUR (€)
Jun. 30, 2022
EUR (€)
Jun. 30, 2021
EUR (€)
Jun. 30, 2022
EUR (€)
employee
Jun. 30, 2021
EUR (€)
Dec. 31, 2021
EUR (€)
Statement Line Items [Line Items]            
Total revenue   € 23 € 0 € 42 € 0  
Cost of sales   123 0 142 0  
Trade receivables   39 € 20 39 20  
Transaction price allocated to remaining performance obligations   275   275   € 42
Interest expense       923 2,645  
Interest expense on advance payments from customers       781 806  
Total contract liabilities   115   115    
Interest expense on long-term loans       102 155  
Interest expense on lease liabilities       € 39 23  
Interest expense on mandatory convertible bonds         € 1,661  
Percentage of annual gross salary of employees that will be granted as stock options 10.00%          
Minimum stock option per year and employee that will be granted € 5          
Number of employees who signed the plan | employee       0    
Integration of solar technology            
Statement Line Items [Line Items]            
Total revenue   21   € 39    
Cost of sales   121   140    
Sono app [member]            
Statement Line Items [Line Items]            
Total revenue   2   3    
Cost of sales   € 1   € 2