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Net Income Per Common Share
 12 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Net Income Per Common Share Net Income Per Common Share
Information regarding the calculation of basic and diluted net income per common share for the years ended September 30, 2023, 2022 and 2021 is as follows (dollars in thousands, except per share amounts):
 202320222021
Basic net income per common share computation   
Numerator - net income $27,118 $23,600 $27,583 
  Denominator - weighted average common shares outstanding8,175,898 8,304,002 8,340,983 
Basic net income per common share$3.32 $2.84 $3.31 
Diluted net income per common share computation   
Numerator - net income $27,118 $23,600 $27,583 
  Denominator - weighted average common shares outstanding8,175,898 8,304,002 8,340,983 
Effect of dilutive stock options (1)72,283 79,333 103,350 
  Weighted average common shares outstanding-assuming dilution8,248,181 8,383,335 8,444,333 
Diluted net income per common share$3.29 $2.82 $3.27 
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(1) For the years ended September 30, 2023, 2022 and 2021, average options to purchase 207,803, 204,265 and 136,148 shares of common stock, respectively, were outstanding but not included in the computation of diluted net income per common share, because their effect would have been anti-dilutive.