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Common Stock Options (Schedule of Stock Option Activity) (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Number of Shares        
Options outstanding, beginning balance (in shares) 52,400 38,000 21,000  
Options granted (in shares) 16,000 17,000 17,000  
Options exercised (in shares) (2,200) (2,600) 0  
Options expired (in shares) 0 0 0  
Options forfeited (in shares) (8,000) 0 0  
Options outstanding, ending balance (in shares) 58,200 52,400 38,000 21,000
Vested and exercisable at end of period (in shares) 58,200      
Weighted- Average Exercise Price        
Options outstanding, beginning balance (in usd per share) $ 19.83 $ 18.98 $ 19.01  
Options granted (in usd per share) 21.22 21.60 18.95  
Options exercised (in usd per share) 18.98 18.99 0.00  
Options expired (in usd per share) 0.00 0.00 0.00  
Options forfeited (in usd per share) 19.80 0.00 0.00  
Options outstanding, ending balance (in usd per share) 20.25 $ 19.83 $ 18.98 $ 19.01
Vested and exercisable at end of period (in usd per share) $ 20.25      
Options, Additional Disclosures        
Weighted- Average Remaining Contractual Terms (years) 7 years 10 months 8 years 4 months 8 years 9 months 9 years 6 months
Weighted-Average Remaining Contractual Term, Vested and exercisable at September 30, 2016 7 years 10 months      
Aggregate Intrinsic Value $ 200,211 $ 43,086 $ 34,840 $ 5,229
Aggregate Intrinsic Value, Vested and exercisable at end of period $ 200,211