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Summary of Stock Options Outstanding and Exercisable (Details) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]        
Options Outstanding Shares 190,100 201,800 159,000 89,700
Options Outstanding, Weighted Average Remaining Term 5 years 2 months 12 days      
Options Outstanding Weighted Average Exercise Price $ 17.81 $ 17.47 $ 16.23 $ 17.27
Options Outstanding Intrinsic Value $ 120,540      
Options Exercisable Shares 24,500      
Option Exercisable Weighted Average Remaining Term 4 years 1 month 6 days      
Options Exercisable Weighted Average Exercise Price $ 17.18      
Options Exercisable Intrinsic Value $ 120,540      
Range One        
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]        
Range of Exercise Prices $ 8.78      
Options Outstanding Shares 24,500      
Options Outstanding, Weighted Average Remaining Term 2 months 12 days      
Options Outstanding Weighted Average Exercise Price $ 8.78      
Options Outstanding Intrinsic Value $ 120,540      
Options Exercisable Shares 24,500      
Option Exercisable Weighted Average Remaining Term 2 months 12 days      
Options Exercisable Weighted Average Exercise Price $ 8.78      
Options Exercisable Intrinsic Value $ 120,540      
Range Two        
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]        
Range of Exercise Prices $ 14.87      
Options Outstanding Shares 69,300      
Options Outstanding, Weighted Average Remaining Term 7 years 1 month 6 days      
Options Outstanding Weighted Average Exercise Price $ 14.87      
Range Three        
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]        
Range of Exercise Prices Minimum 21.42      
Range of Exercise Prices Maximum $ 26.48      
Options Outstanding Shares 96,300      
Options Outstanding, Weighted Average Remaining Term 5 years 1 month 6 days      
Options Outstanding Weighted Average Exercise Price $ 22.32      
Option Exercisable Weighted Average Remaining Term 2 years 6 months      
Options Exercisable Weighted Average Exercise Price $ 23.30