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Income Taxes, Valuation Allowance (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards, Components [Abstract] |  |  |
Valuation allowance | $ 10,200,000 |  |
Unrecognized tax benefits | 134,595 | $ 134,595 | $ 134,595
Income tax penalties and interest | 0 | 0 |
Greece [Member] |  |  |
Operating Loss Carryforwards, Components [Abstract] |  |  |
Net operating loss carryforwards | $ 4,200,000 |  |
Operating loss carryforwards, expiration year | Dec. 31, 2026 |  |
Denmark [Member] |  |  |
Operating Loss Carryforwards, Components [Abstract] |  |  |
Net operating loss carryforwards | $ 8,300,000 |  |
Germany [Member] |  |  |
Operating Loss Carryforwards, Components [Abstract] |  |  |
Net operating loss carryforwards | 14,600,000 |  |
U.S. Federal [Member] |  |  |
Operating Loss Carryforwards, Components [Abstract] |  |  |
Net operating loss carryforwards | $ 28,200,000 | 4,000,000.0 |
Operating loss carryforwards, expiration year | Dec. 31, 2033 |  |
State [Member] |  |  |
Operating Loss Carryforwards, Components [Abstract] |  |  |
Net operating loss carryforwards | $ 27,200,000 | $ 2,200,000 |
Operating loss carryforwards, expiration year | Dec. 31, 2033 |  |

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