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Note 1 - Summary of Significant Accounting Policies (Details Textual) - EUR (€) € in Thousands, shares in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Product Warranty Expense		€ 131	€ 433	€ 316
Advertising Expense		€ 739	€ 719	€ 672
Class of Warrant or Right, Outstanding (in shares)		0	0
Operating Lease, Liability, Total		€ 2,684
Operating Lease, Right-of-Use Asset		€ 2,647
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total					€ 35,000
Operating Lease, Right-of-Use Asset					€ 35,000
Minimum [Member]
Revenue from Contract with Customer, Customer Payment Period (Month)		30 days
Standard Product Warranty Period (Year)		1 year
Maximum [Member]
Revenue from Contract with Customer, Customer Payment Period (Month)		90 days
Standard Product Warranty Period (Year)		2 years
Maximum [Member] | Devices Leased Under RPPs and Devices Subject to Sale and Leaseback Transactions [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years

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- Definition

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
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- Definition

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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