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Note 11 - Deferred Revenues - Deferred Revenue Recognition Period 2 (Details) - Extension of Warranty [Member] € in Thousands	Dec. 31, 2019 EUR (€)
Revenue, remaining performance obligation, amount	€ 837
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year)	1 year
Revenue, remaining performance obligation, amount	€ 237
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year)	1 year
Revenue, remaining performance obligation, amount	€ 268
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year)	1 year
Revenue, remaining performance obligation, amount	€ 257
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year)	1 year
Revenue, remaining performance obligation, amount	€ 70
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year)	1 year
Revenue, remaining performance obligation, amount	€ 4

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

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X

- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

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