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4. Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Reconciliation of income taxes
     2020     2019  
U.S. Federal statutory rates on net loss before income taxes   E (868 )   E (879 )
Effect of foreign statutory rate differences     (40 )     (43 )
Effect of exchange rate changes     1,275       39  
Expiration of net operating loss carry forwards     123       200  
Permanent differences     --       --  
Change in valuation allowance     (465 )     705  
Income tax provision   E 25     E 22  
Loss before provision for income taxes
     2020     2019  
United States   E 3,147     E 3,093  
Switzerland     --       172  
The Netherlands     1,014       900  
Loss before provision   E 4,161     E 4,165  
Deferred tax assets
     2020     2019  
Licenses capitalized for United States tax purposes   E 129     E 217  
Stock options     160       160  
Foreign tax credit carry over     209       224  
Net operating loss carry forwards                
United States     16,167       16,692  
Switzerland     16       44  
The Netherlands     1,322       1,131  
                  
       18,003       18,468  
Less valuation allowance for deferred tax asset     (18,003 )     (18,468 )
Net deferred tax asset   E --     E --  
Operating loss carryforwards
      United States     Switzerland     The Netherlands
2021     948     --     E  629
2022       1,775       --                                --
2023       1,182                           --       43
2024                    1,226                         63                                          --
2025       1,380        --       731
2026-2038       67,203       --       3,886
Perpetual       3,273       --                                --
        E 76,987     E 63     E 5,289