Income Taxes (Details 2) - EUR (€)	Dec. 31, 2021	Dec. 31, 2020
Licenses capitalized for United States tax purposes	€ 60,000	€ 129,000
Stock options	160,000	160,000
Foreign tax credit carry over	226,000	209,000
Gross deferred tax asset	19,928,000	18,003,000
Less valuation allowance for deferred tax asset	(19,928,000)	(18,003,000)
Net deferred tax asset	0	0
United States
Net operating loss carry forwards	18,067,000	16,167,000
Switzerland
Net operating loss carry forwards	61,000	16,000
The Netherlands
Net operating loss carry forwards	€ 1,354,000	€ 1,322,000