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Stock Compensation Plans - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Available to Grant |  |  |
Available to grant beginning of period | 694,850 | 86,672 | 245,350
Available to grant end of period | 487,600 | 694,850 | 86,672
Shares Under Option |  |  |
Options outstanding at beginning of period | 1,064,917 | 1,033,303 | 971,107
Granted | 210,300 | 208,400 | 202,700
Exercised | (22,762) | (136,801) | (91,285)
Options outstanding at end of period | 1,240,305 | 1,064,917 | 1,033,303
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price beginning of period | $ 53.671 | $ 50.528 | $ 48.079
Exercised | 38.830 | 42.149 | 40.532
Weighted Average Exercise Price, end of period | $ 53.857 | $ 53.671 | $ 50.528
2018 Plan |  |  |
Available to Grant |  |  |
Granted |  | (2,500) | (202,700)
Termination |  | (123,407) |
Shares Under Option |  |  |
Granted |  | 2,500 | 202,700
Options outstanding at end of period | 612,511 |  |
Weighted Average Exercise Price |  |  |
Granted |  | $ 61.550 | $ 57.980
2022 Plan |  |  |
Available to Grant |  |  |
Granted | (210,300) | (205,900) |
Available to Grant from 2022 Plan |  | 900,000 |
Shares Under Option |  |  |
Granted | 210,300 | 205,900 |
Options outstanding at end of period | 412,400 |  |
Weighted Average Exercise Price |  |  |
Granted | $ 53.166 | $ 61.505 |
Current plans |  |  |
Available to Grant |  |  |
Forfeited | 3,050 | 750 | 44,022
Shares Under Option |  |  |
Forfeited | (3,050) | (750) | (44,022)
Weighted Average Exercise Price |  |  |
Forfeited | $ 61.550 | $ 61.550 | $ 52.256
Terminated plans |  |  |
Available to Grant |  |  |
Forfeited |  | 39,235 |
Shares Under Option |  |  |
Forfeited | (9,100) | (39,235) | (5,197)
Weighted Average Exercise Price |  |  |
Forfeited | $ 51.123 | $ 52.523 | $ 44.563
Employee Stock Option |  |  |
Shares Under Option |  |  |
Options outstanding at beginning of period | 1,064,917 |  |
Granted | 210,300 |  |
Exercised | (22,762) |  |
Forfeited | (12,150) |  |
Options outstanding at end of period | 1,240,305 | 1,064,917 |
Options exercisable, end of period | 571,490 |  |
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price beginning of period | $ 53.671 |  |
Granted | 53.166 |  |
Exercised | 38.830 |  |
Forfeited | 53.741 |  |
Weighted Average Exercise Price, end of period | 53.857 | $ 53.671 |
Weighted Average Exercise Price, exercisable, end of period | $ 51.688 |  |
Weighted Average Remaining Contractual Term | 6 years 8 months 26 days | 7 years 1 month 17 days |
Weighted Average Remaining contractual Term, exercisable | 4 years 7 months 20 days |  |

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