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Net Income Per Common Share
 12 Months Ended
Sep. 30, 2020
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, 2020, 2019 and 2018 is as follows (dollars in thousands, except per share amounts):
 202020192018
Basic net income per common share computation   
Numerator - net income $24,269 $24,020 $16,721 
  Denominator - weighted average common shares outstanding8,326,600 8,318,928 7,334,577 
Basic net income per common share$2.91 $2.89 $2.28 
Diluted net income per common share computation   
Numerator - net income $24,269 $24,020 $16,721 
  Denominator - weighted average common shares outstanding8,326,600 8,318,928 7,334,577 
Effect of dilutive stock options (1)95,886 149,298 191,767 
  Weighted average common shares outstanding-assuming dilution8,422,486 8,468,226 7,526,344 
Diluted net income per common share$2.88 $2.84 $2.22 
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(1) For the years ended September 30, 2020, 2019 and 2018, average options to purchase 131,186, 102,920 and 29,581 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.