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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
Nov. 07, 2019
EUR (€)
shares
Jul. 31, 2020
€ / shares
shares
Dec. 31, 2020
EUR (€)
shares
Dec. 31, 2019
EUR (€)
shares
Jul. 31, 2020
$ / shares
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Liquidity risk              
Expected cash flows receivables with in two months     € 16,154        
Common per share | (per share)   € 12.71     $ 14.00    
Net offering proceeds, after deducting underwriting discounts, commissions and transaction costs     22,000        
Cash and cash equivalents     48,156 € 41,095   € 9,222 € 3,157
Carrying amount     55,834 35,524      
Total     59,351 40,012      
Reconciliation of liabilities arising from financing activities              
Beginning of year     26,970 19,679      
Cash flows     (7,513) (14,397)      
Additions     4,692 21,688      
Changes in maturity     (51)        
End of year     24,098 26,970      
Non-current financial liabilities              
Reconciliation of liabilities arising from financing activities              
Beginning of year     19,647 14,627      
Cash flows     (1,993) (12,783)      
Additions     2,029 18,910      
Changes in maturity     (1,605) (1,107)      
End of year     18,078 19,647      
Non-current lease liabilities              
Reconciliation of liabilities arising from financing activities              
Beginning of year     18,069 1,712      
Cash flows     (1,383) (1,696)      
Additions     2,029 18,910      
Changes in maturity     (1,038) (857)      
End of year     17,677 18,069      
Current financial liabilities              
Reconciliation of liabilities arising from financing activities              
Beginning of year     7,323 5,052      
Cash flows     (5,520) (1,614)      
Additions     2,663 2,778      
Changes in maturity     1,554 1,107      
End of year     6,020 7,323      
Non-current portion of secured bank loans              
Reconciliation of liabilities arising from financing activities              
Beginning of year     968 12,055      
Cash flows       (11,087)      
Changes in maturity     (567)        
End of year     401 968      
Municipal loans              
Reconciliation of liabilities arising from financing activities              
Beginning of year     610 860      
Cash flows     (610)        
Changes in maturity       (250)      
End of year       610      
Current portion of secured bank loans              
Reconciliation of liabilities arising from financing activities              
Beginning of year     802 1,787      
Cash flows     (865) (985)      
Additions     63        
Changes in maturity     567        
End of year     567 802      
Bank Loans              
Reconciliation of liabilities arising from financing activities              
Cash flows     438        
Changes in maturity     (51)        
End of year     387        
Bank overdrafts              
Reconciliation of liabilities arising from financing activities              
Beginning of year     2,636 1,915      
Cash flows     (1,208) 721      
Additions     110        
End of year     1,538 2,636      
Municipal loans              
Reconciliation of liabilities arising from financing activities              
Beginning of year     250        
Cash flows     (250)        
Changes in maturity       250      
End of year       250      
Current lease liabilities              
Reconciliation of liabilities arising from financing activities              
Beginning of year     3,635 1,350      
Cash flows     (3,635) (1,350)      
Additions     2,490 2,778      
Changes in maturity     1,038 857      
End of year     3,528 3,635      
Less than 2 months              
Liquidity risk              
Total     33,270 10,274      
2 to 12 months              
Liquidity risk              
Total     5,072 5,892      
Within five years              
Liquidity risk              
Total     10,269 11,275      
Later than 5 years              
Liquidity risk              
Total     10,740 12,571      
Trade and other receivables due with in two months              
Liquidity risk              
Expected cash flows     14,857 6,644      
Bank overdrafts              
Liquidity risk              
Carrying amount     1,538 2,636      
Total     1,538 2,636      
Bank overdrafts | Less than 2 months              
Liquidity risk              
Total     € 1,538 € 2,636      
Bank overdrafts | 2 to 12 months              
Liquidity risk              
Interest-bearing loans will mature in less than one year (in percent)     25.00% 27.20%      
Secured bank loans              
Liquidity risk              
Utilized amount of secured credit lines     € 1,538 € 2,636      
Carrying amount     968 1,770      
Secured bank loans     3,500 4,000      
Total     € 997 € 1,866      
Secured bank loans | Minimum              
Liquidity risk              
Interest rate on secured credit lines     3.75% 3.33%      
Secured bank loans | Maximum              
Liquidity risk              
Interest rate on secured credit lines     4.75% 4.50%      
Secured bank loans | Less than 2 months              
Liquidity risk              
Total     € 5 € 12      
Secured bank loans | 2 to 12 months              
Liquidity risk              
Total     584 848      
Secured bank loans | Within five years              
Liquidity risk              
Total     408 1,006      
Other bank loans              
Liquidity risk              
Carrying amount     387        
Total     394        
Other bank loans | 2 to 12 months              
Liquidity risk              
Total     394        
Lease liabilities              
Liquidity risk              
Carrying amount     21,205 21,704      
Total     24,897 25,934      
Lease liabilities | Less than 2 months              
Liquidity risk              
Total     716 755      
Lease liabilities | 2 to 12 months              
Liquidity risk              
Total     3,580 3,034      
Lease liabilities | Within five years              
Liquidity risk              
Total     9,861 9,574      
Lease liabilities | Later than 5 years              
Liquidity risk              
Total     10,740 12,571      
Municipal loans              
Liquidity risk              
Carrying amount       860      
Total       1,022      
Municipal loans | 2 to 12 months              
Liquidity risk              
Total       327      
Municipal loans | Within five years              
Liquidity risk              
Total       695      
Trade payables              
Liquidity risk              
Carrying amount     31,736 8,554      
Total     31,525 8,554      
Trade payables | Less than 2 months              
Liquidity risk              
Total     31,011 6,871      
Trade payables | 2 to 12 months              
Liquidity risk              
Total     € 514 € 1,683      
Common shares              
Liquidity risk              
Net offering proceeds, after deducting underwriting discounts, commissions and transaction costs € 42,000            
Increase (decrease) in number of ordinary shares issued | shares 4,000,000   2,000,000 4,000,000      
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