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Financial instruments-fair values and risk management - Liquidity risk (Details)
€ / shares in Units, € in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2022
EUR (€)
shares
Jul. 31, 2020
$ / shares
shares
Dec. 31, 2022
EUR (€)
shares
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
shares
Jan. 31, 2022
$ / shares
Jan. 31, 2022
€ / shares
Jan. 01, 2021
EUR (€)
Jul. 31, 2020
€ / shares
Dec. 31, 2019
EUR (€)
Liquidity risk                    
Expected cash flows receivables with in two months     € 1,243              
Common per share | (per share)   $ 14.00             € 12.71  
Net offering proceeds, after deducting underwriting discounts, commissions and transaction costs € 15,000   22,000              
Number of common shares issued (in shares) | shares 4,479,088                  
Share price | (per share)           $ 3.73 € 3.35      
Cash and cash equivalents     35,951 € 17,818 € 48,156     € 48,156   € 41,095
Carrying amount     66,439   55,834          
Total     86,877   59,351          
Reconciliation of liabilities arising from financing activities                    
Beginning of year     22,539 24,098            
Cash flows     35,113 (3,475)            
Additions     1,384 2,303            
Changes in maturity     1,086 (387)            
End of year     60,122 22,539 24,098          
Non-current financial liabilities                    
Reconciliation of liabilities arising from financing activities                    
Beginning of year     15,394 18,078            
Cash flows     36,631 (594)            
Additions     65 865            
Changes in maturity     1,086 (2,955)            
End of year     53,176 15,394 18,078          
Non-current lease liabilities                    
Reconciliation of liabilities arising from financing activities                    
Beginning of year     15,394 17,677            
Cash flows     (2,334) (193)            
Additions     65 865            
Changes in maturity       (2,955)            
End of year     13,125 15,394 17,677          
Current financial liabilities                    
Reconciliation of liabilities arising from financing activities                    
Beginning of year     7,145 6,020            
Cash flows     (1,518) (2,881)            
Additions     1,319 1,438            
Changes in maturity       2,568            
End of year     6,946 7,145 6,020          
Non-current portion of secured bank loans                    
Reconciliation of liabilities arising from financing activities                    
Beginning of year       401            
Cash flows     38,965 (401)            
Changes in maturity     1,086              
End of year     40,051   401          
Current portion of secured bank loans                    
Reconciliation of liabilities arising from financing activities                    
Beginning of year     505 567            
Cash flows     (505) (62)            
Additions     1,261              
End of year     1,261 505 567          
Bank Loans                    
Reconciliation of liabilities arising from financing activities                    
Beginning of year       387            
Changes in maturity       (387)            
End of year         387          
IFRS Bank overdrafts                    
Reconciliation of liabilities arising from financing activities                    
Beginning of year     3,310 1,538            
Cash flows     64 1,505            
Additions       267            
End of year     3,374 3,310 1,538          
Current lease liabilities                    
Reconciliation of liabilities arising from financing activities                    
Beginning of year     3,330 3,528            
Cash flows     (1,077) (4,324)            
Additions     58 1,171            
Changes in maturity       2,955            
End of year     2,311 3,330 3,528          
Major ordinary share transactions                    
Liquidity risk                    
Net offering proceeds, after deducting underwriting discounts, commissions and transaction costs € 15,000                  
Number of common shares issued (in shares) | shares 4,479,088                  
Share price | $ / shares           $ 3.73        
Less than 2 months                    
Liquidity risk                    
Total     10,921   33,270          
2 to 12 months                    
Liquidity risk                    
Total     5,781   5,072          
1 - 5 years                    
Liquidity risk                    
Total     63,246   10,269          
More than five years                    
Liquidity risk                    
Total     6,929   10,740          
Trade and other receivables due with in two months                    
Liquidity risk                    
Expected cash flows     7,251 6,418 14,857          
IFRS Bank overdrafts                    
Liquidity risk                    
Carrying amount     3,374 3,310 1,538          
Total     3,374 3,310 1,538          
IFRS Bank overdrafts | Less than 2 months                    
Liquidity risk                    
Total     € 3,374 € 3,310 € 1,538          
IFRS Bank overdrafts | 2 to 12 months                    
Liquidity risk                    
Interest-bearing loans will mature in less than one year (in percent)     11.60% 31.70% 25.00%          
Secured bank loans                    
Liquidity risk                    
Utilized amount of secured credit lines     € 3,374 € 3,310 € 1,538          
Carrying amount     41,312 505 968          
Secured bank loans     3,500 3,500 3,500          
Total     € 59,473 € 505 € 997          
Secured bank loans | Minimum                    
Liquidity risk                    
Interest rate on secured credit lines     4.31% 3.75% 3.75%          
Secured bank loans | Maximum                    
Liquidity risk                    
Interest rate on secured credit lines     4.75% 4.75% 4.75%          
Secured bank loans | Less than 2 months                    
Liquidity risk                    
Total     € 678 € 105 € 5          
Secured bank loans | 2 to 12 months                    
Liquidity risk                    
Total     3,516 400 584          
Secured bank loans | 1 - 5 years                    
Liquidity risk                    
Total     55,279   408          
Other bank loans                    
Liquidity risk                    
Carrying amount       18,724 387          
Total       21,777 394          
Other bank loans | Less than 2 months                    
Liquidity risk                    
Total       703            
Other bank loans | 2 to 12 months                    
Liquidity risk                    
Total       3,337 394          
Other bank loans | 1 - 5 years                    
Liquidity risk                    
Total       8,844            
Other bank loans | More than five years                    
Liquidity risk                    
Total       8,893            
Lease liabilities                    
Liquidity risk                    
Carrying amount     15,436 11,252 21,205          
Total     17,713 11,252 24,897          
Lease liabilities | Less than 2 months                    
Liquidity risk                    
Total     552 11,252 716          
Lease liabilities | 2 to 12 months                    
Liquidity risk                    
Total     2,265   3,580          
Lease liabilities | 1 - 5 years                    
Liquidity risk                    
Total     7,967   9,861          
Lease liabilities | More than five years                    
Liquidity risk                    
Total     6,929   10,740          
Trade payables                    
Liquidity risk                    
Carrying amount     6,317 33,791 31,736          
Total     6,317 36,844 31,525          
Trade payables | Less than 2 months                    
Liquidity risk                    
Total     € 6,317 15,370 31,011          
Trade payables | 2 to 12 months                    
Liquidity risk                    
Total       3,737 € 514          
Trade payables | 1 - 5 years                    
Liquidity risk                    
Total       8,844            
Trade payables | More than five years                    
Liquidity risk                    
Total       € 8,893            
Common shares                    
Liquidity risk                    
Increase (decrease) in number of ordinary shares issued | shares     4,998,000   2,000,000          
Common shares | Follow-on public offering                    
Liquidity risk                    
Total number of shares issued and sold in follow-on public offering | shares   3,500,000                
Number of shares offered by existing shareholders | shares   1,500,000                
The Company | Common shares | Follow-on public offering                    
Liquidity risk                    
Increase (decrease) in number of ordinary shares issued | shares   2,000,000