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Net Income Per Common Share - Antidilutive Securities (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Employee stock option        
Schedule of antidilutive securities excluded from computation of earnings per share        
Number of shares (in shares) 9,750 19,929 19,750 19,929