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4. Income Taxes (Details 2) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Licenses capitalized for United States tax purposes € 129 € 217
Stock options 160 160
Foreign tax credit carry over 209 224
Gross deferred tax asset 18,003 18,468
Less valuation allowance for deferred tax asset (18,003) (18,468)
Net deferred tax asset 0 0
United States    
Net operating loss carry forwards 16,167 16,692
Switzerland    
Net operating loss carry forwards 16 44
The Netherlands    
Net operating loss carry forwards € 1,322 € 1,131