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Note 10 - Deferred Revenues - Deferred Revenue Recognition Period 2 (Details) - Extension of Warranty [Member] € in Thousands	Dec. 31, 2018 EUR (€)
Revenue, remaining performance obligation, amount	€ 855
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, remaining performance obligation, expected timing of satisfaction, period (Year)	1 year
Revenue, remaining performance obligation, amount	€ 167
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	€ 264
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	€ 218
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	€ 162
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	€ 44

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=109196051&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=109196051&loc=SL49130556-203045

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