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Additional disclosures to financial instruments (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial instruments    
Financial liabilities € 27,084 € 21,156
Total liabilities    
Financial instruments    
Financial liabilities 29,040  
Current liabilities    
Financial instruments    
Financial liabilities 21,726  
Trade payables    
Financial instruments    
Financial liabilities 1,956 2,797
Financial liabilities    
Financial instruments    
Financial liabilities 19,770  
Financial liabilities, at fair value 25,666  
Financial liabilities | Level Two    
Financial instruments    
Financial liabilities, at fair value 808  
Financial liabilities | Level Three    
Financial instruments    
Financial liabilities, at fair value 24,858  
Derivative financial instruments    
Financial instruments    
Financial liabilities 808  
Financial liabilities, at fair value 808  
Derivative financial instruments | Level Two    
Financial instruments    
Financial liabilities, at fair value 808  
Long term debt    
Financial instruments    
Financial liabilities 18,650 10,864
Financial liabilities, at fair value 24,858 10,858
Long term debt | Level Three    
Financial instruments    
Financial liabilities, at fair value 24,858 10,858
Lease liability    
Financial instruments    
Financial liabilities 312  
Non-current liabilities    
Financial instruments    
Financial liabilities 7,314  
Non-current financial liabilities    
Financial instruments    
Financial liabilities 7,314  
Financial liabilities, at fair value 4,203  
Non-current financial liabilities | Level Three    
Financial instruments    
Financial liabilities, at fair value 4,203  
Non-current long term debt    
Financial instruments    
Financial liabilities 4,502 6,682
Financial liabilities, at fair value 4,203 6,148
Non-current long term debt | Level Three    
Financial instruments    
Financial liabilities, at fair value 4,203 6,148
Non-current lease liability    
Financial instruments    
Financial liabilities 2,812  
Financial liabilities measured at amortized cost | Total liabilities    
Financial instruments    
Financial liabilities 25,108  
Financial liabilities measured at amortized cost | Current liabilities    
Financial instruments    
Financial liabilities 20,606  
Financial liabilities measured at amortized cost | Trade payables    
Financial instruments    
Financial liabilities 1,956 2,797
Financial liabilities measured at amortized cost | Financial liabilities    
Financial instruments    
Financial liabilities 18,650  
Financial liabilities measured at amortized cost | Long term debt    
Financial instruments    
Financial liabilities 18,650 10,864
Financial liabilities measured at amortized cost | Non-current liabilities    
Financial instruments    
Financial liabilities 4,502  
Financial liabilities measured at amortized cost | Non-current financial liabilities    
Financial instruments    
Financial liabilities 4,502  
Financial liabilities measured at amortized cost | Non-current long term debt    
Financial instruments    
Financial liabilities 4,502 6,682
Total assets    
Financial instruments    
Financial assets 15,360  
Current assets    
Financial instruments    
Financial assets 15,355  
Cash and cash equivalents    
Financial instruments    
Financial assets 5,324 4,368
Financial assets, at fair value   4,368
Cash and cash equivalents | Level One    
Financial instruments    
Financial assets, at fair value   4,368
Financial assets    
Financial instruments    
Financial assets 5,351  
Financial assets, at fair value 5,351  
Financial assets | Level One    
Financial instruments    
Financial assets, at fair value 2,984  
Financial assets | Level Two    
Financial instruments    
Financial assets, at fair value 2,367  
Bond funds    
Financial instruments    
Financial assets 984 3,667
Financial assets, at fair value 984 3,667
Bond funds | Level One    
Financial instruments    
Financial assets, at fair value 984 3,667
Bond funds (restricted)    
Financial instruments    
Financial assets 2,000 2,000
Financial assets, at fair value 2,000 2,000
Bond funds (restricted) | Level One    
Financial instruments    
Financial assets, at fair value 2,000 2,000
Derivative financial instruments    
Financial instruments    
Financial assets 2,367  
Financial assets, at fair value 2,367  
Derivative financial instruments | Level Two    
Financial instruments    
Financial assets, at fair value 2,367  
Note receivable    
Financial instruments    
Financial assets   1,278
Financial assets, at fair value   1,278
Note receivable | Level One    
Financial instruments    
Financial assets, at fair value   1,278
Restricted Cash    
Financial instruments    
Financial assets   463
Financial assets, at fair value   463
Restricted Cash | Level One    
Financial instruments    
Financial assets, at fair value   463
Trade receivables, net    
Financial instruments    
Financial assets 4,680 5,915
Non-current assets    
Financial instruments    
Financial assets 5  
Non-current financial assets    
Financial instruments    
Financial assets 5  
Financial assets, at fair value 5  
Non-current financial assets | Level Three    
Financial instruments    
Financial assets, at fair value 5  
Non-current derivative financial instruments    
Financial instruments    
Financial assets   2,274
Financial assets, at fair value   2,274
Non-current derivative financial instruments | Level Two    
Financial instruments    
Financial assets, at fair value   2,274
Non-current equity securities    
Financial instruments    
Financial assets 5 5
Financial assets, at fair value 5 5
Non-current equity securities | Level Three    
Financial instruments    
Financial assets, at fair value 5 5
FVTPL | Total liabilities    
Financial instruments    
Financial liabilities 808  
FVTPL | Current liabilities    
Financial instruments    
Financial liabilities 808  
FVTPL | Financial liabilities    
Financial instruments    
Financial liabilities 808  
FVTPL | Derivative financial instruments    
Financial instruments    
Financial liabilities 808  
FVTPL | Total assets    
Financial instruments    
Financial assets 5,351  
FVTPL | Current assets    
Financial instruments    
Financial assets 5,351  
FVTPL | Financial assets    
Financial instruments    
Financial assets 5,351  
FVTPL | Bond funds    
Financial instruments    
Financial assets 984 3,667
FVTPL | Bond funds (restricted)    
Financial instruments    
Financial assets 2,000 2,000
FVTPL | Derivative financial instruments    
Financial instruments    
Financial assets 2,367  
FVTPL | Note receivable    
Financial instruments    
Financial assets   1,278
FVTPL | Non-current derivative financial instruments    
Financial instruments    
Financial assets   2,274
FVOCI | Total assets    
Financial instruments    
Financial assets 5  
FVOCI | Non-current assets    
Financial instruments    
Financial assets 5  
FVOCI | Non-current financial assets    
Financial instruments    
Financial assets 5  
FVOCI | Non-current equity securities    
Financial instruments    
Financial assets 5 5
Assets at amortized cost | Total assets    
Financial instruments    
Financial assets 20,008  
Assets at amortized cost | Current assets    
Financial instruments    
Financial assets 10,004  
Assets at amortized cost | Cash and cash equivalents    
Financial instruments    
Financial assets 5,324 4,368
Assets at amortized cost | Restricted Cash    
Financial instruments    
Financial assets   463
Assets at amortized cost | Trade receivables, net    
Financial instruments    
Financial assets 4,680 5,915
Fair value    
Financial instruments    
Financial assets 5,356 9,687
Fair value | Bond funds    
Financial instruments    
Financial assets 2,984 5,667
Fair value | Bond funds (restricted)    
Financial instruments    
Financial assets 2,000 2,000
Fair value | Derivative financial instruments    
Financial instruments    
Financial assets 2,367  
Fair value | Note receivable    
Financial instruments    
Financial assets   1,278
Fair value | Restricted Cash    
Financial instruments    
Financial assets   463
Fair value | Non-current derivative financial instruments    
Financial instruments    
Financial assets   2,274
Fair value | Non-current equity securities    
Financial instruments    
Financial assets € 5 € 5