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Operating expenses, Shares Held by Directors and Executives (Details) - shares | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Shares Held by Executives and Directors [Abstract] |  |  |  |
Executives and Directors as a group (in shares) | [1] | 2,239,955 | 2,362,991 | 2,143,973
Number of restricted stock subject to vesting conditions (in shares) |  | 355,000 | 400,970 | 498,818
President & Chief Executive Officer [Member] |  |  |  |
Shares Held by Executives and Directors [Abstract] |  |  |  |
Period of base salary entitled to directors and executives in connection with termination of employment |  | 18 months |  |
Chief Financial Officer [Member] |  |  |  |
Shares Held by Executives and Directors [Abstract] |  |  |  |
Period of base salary entitled to directors and executives in connection with termination of employment |  | 12 months |  |
[1] | Includes 355,000 (2024: 400,970, 2023: 498,818) shares of restricted stock subject to vesting conditions.

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- Definition The number of other equity instruments (ie other than share options) subject to vesting conditions in a share-based payment arrangement. + References No definition available. + Details
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- Definition The number of shares held by directors and executives as a group during the period. + References No definition available. + Details
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- Definition Period of base salary entitled to directors and executives upon termination of employment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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