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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, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Product Warranty Expense		€ 433	€ 316	€ 319
Advertising Expense		€ 719	€ 672	€ 744
Class of Warrant or Right, Outstanding		0
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset					€ 2,900
Operating Lease, Liability, Total					€ 2,900
Minimum [Member]
Revenue from Contract with Customer, Customer Payment Period		30 days
Standard Product Warranty Period		1 year	1 year
Maximum [Member]
Revenue from Contract with Customer, Customer Payment Period		90 days
Standard Product Warranty Period		2 years	2 years
Maximum [Member] | Devices Leased Under RPPs and Devices Subject to Sale and Leaseback Transactions [Member]
Property, Plant and Equipment, Useful Life	7 years

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- Definition

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+ References

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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
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-SubTopic 35
-Section 50
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Number of warrants or rights outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
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The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

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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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