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Net Income Per Common Share
 12 Months Ended
Sep. 30, 2022
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, 2022, 2021 and 2020 is as follows (dollars in thousands, except per share amounts):
 202220212020
Basic net income per common share computation   
Numerator - net income $23,600 $27,583 $24,269 
  Denominator - weighted average common shares outstanding8,304,002 8,340,983 8,326,600 
Basic net income per common share$2.84 $3.31 $2.91 
Diluted net income per common share computation   
Numerator - net income $23,600 $27,583 $24,269 
  Denominator - weighted average common shares outstanding8,304,002 8,340,983 8,326,600 
Effect of dilutive stock options (1)79,333 103,350 95,886 
  Weighted average common shares outstanding-assuming dilution8,383,335 8,444,333 8,422,486 
Diluted net income per common share$2.82 $3.27 $2.88 

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(1) For the years ended September 30, 2022, 2021 and 2020, average options to purchase 204,265, 136,148 and 131,186 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.