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3. Income Taxes (Details 1) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Licenses capitalized for United States tax purposes € 295 € 357
Stock options 160 157
Foreign tax credit carry over 224 214
Deferred tax asset, gross 17,763 16,148
Less valuation allowance for deferred tax asset (17,763) (16,148)
Net deferred tax asset 0 0
United States    
Net operating loss carry forwards 16,017 14,687
Switzerland    
Net operating loss carry forwards 160 299
The Netherlands    
Net operating loss carry forwards € 907 € 434