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Operating expenses, Shares Held by Directors and Executives (Details) - shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Shares Held by Executives and Directors [Abstract]      
Executives and Directors as a group (in shares) [1] 2,362,991 2,143,973 1,908,331
Number of restricted stock subject to vesting conditions (in shares) 400,970 498,818 595,832
Number of restricted stock, vested not issued (in shares) 139,713    
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 400,970 (2023: 498,818, 2022: 595,832) shares of restricted stock subject to vesting conditions and 139,713 shares of restricted stock vested but not issued.