Legal Matters Legal Matters (Details) - EUR (€)	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Legal Costs, Policy [Policy Text Block]		Costs associated with the Company's involvement in legal proceedings are expensed as incurred.
Loss Contingency, Damages Sought, per unit produced.	€ 10,000
Loss Contingency, Damages Sought, Value	€ 10,000,000	€ 10,000,000

Disclosure of accounting policy for legal costs incurred to protect or defend the entity's assets and rights, or to obtain assets, including monetary damages, or to obtain rights.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18726-107790

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149975-122751

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Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration