3. Income Taxes (Details) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. Federal statutory rates on net loss before income taxes	€ (876)	€ (1,396)
Effect of foreign statutory rate differences	(43)	(36)
Effect of exchange rate changes	(952)	3,516
Expiration/disallowance of net operating loss carry forwards	299	580
Permanent differences	(24)	(12)
Deferred tax impact from tax rate change	0	9,422
Change in valuation allowance	1,615	(12,069)
Income tax provision	€ 19	€ 5