Financial liabilities - Conditions and statement of liabilities (Details) - EUR (€) € in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial liabilities
Nominal amount	€ 24,476	€ 24,098
Carrying amount	24,476	24,098
Bank overdrafts	907	910
Secured bank loans
Financial liabilities
Financial assets pledged as collateral for liabilities or contingent liabilities	€ 1,500	€ 1,500
Secured Bank Loans With Maturity Period 2017 To 22
Financial liabilities
Nominal interest rate (as a percent)	2.95%	2.95%
Nominal amount	€ 768	€ 968
Carrying amount	€ 768	€ 968
Other bank loans
Financial liabilities
Nominal interest rate (as a percent)	1.00%	1.00%
Nominal amount	€ 405	€ 387
Carrying amount	€ 405	€ 387
Bank overdrafts, one
Financial liabilities
Nominal interest rate (as a percent)	4.75%	4.75%
Nominal amount	€ 497	€ 498
Carrying amount	€ 497	€ 498
Bank overdrafts, two
Financial liabilities
Nominal interest rate (as a percent)	3.75%	3.75%
Nominal amount	€ 2,215	€ 628
Carrying amount	€ 2,215	€ 628
Bank overdrafts, three
Financial liabilities
Nominal interest rate (as a percent)	4.50%	4.50%
Nominal amount	€ 410	€ 412
Carrying amount	410	412
Lease liabilities
Financial liabilities
Nominal amount	20,181	21,205
Carrying amount	€ 20,181	€ 21,205
Minimum \| Lease liabilities
Financial liabilities
Nominal interest rate (as a percent)	5.40%	5.40%
Nominal interest rate at commencement of leases	2.10%	2.10%
Maximum \| Lease liabilities
Financial liabilities
Nominal interest rate (as a percent)	9.10%	9.10%
Nominal interest rate at commencement of leases	3.50%
Overdraft facility
Financial liabilities
Financial assets pledged as collateral for liabilities or contingent liabilities	€ 1,000	€ 1,000
Short-term deposits, pledged as security	2,500	2,500
Existing Overdraft facility
Financial liabilities
Financial assets pledged as collateral for liabilities or contingent liabilities	2,500	€ 2,500
Second Overdraft facility
Financial liabilities
Short-term deposits, pledged as security	€ 500

The amount of financial liabilities interest bearing.

No definition available.

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- Definition

The amount of short-term deposits pledged as security for liabilities.

+ References

No definition available.

+ Details

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- Definition

The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2019-01-01
-Paragraph 45
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- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2019-01-01
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-URIDate 2019-03-27

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2019-01-01
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- Definition

The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2019-03-27

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