Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Stock Option Activity (Details)

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Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Number of Shares      
Outstanding, beginning balance 231,668 211,668  
Granted   20,000  
Forfeited (31,250)    
Outstanding, ending balance 200,418 231,668 211,668
Exercisable 168,084 175,000  
Weighted Average Exercise Price      
Outstanding, beginning balance $ 14.84 $ 13.19  
Granted   32.24  
Outstanding, ending balance 16.05 14.84 $ 13.19
Exercisable $ 13.92 $ 11.89  
Weighed Average Remaining Contractual Life      
Outstanding, ending balance 2 years 4 months 24 days 3 years 14 days 3 years 5 months 19 days
Granted   9 years 7 days  
Exercisable 1 year 5 months 8 days 2 years 29 days  
Intrinsic value outstanding balance $ 26,750 $ 162,500 $ 454,117
Exercisable $ 26,750 $ 162,500