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Share-Based Compensation - Stock option plan (Details)
12 Months Ended
Sep. 30, 2018
USD ($)
item
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Share-based compensation      
Share-based compensation expense $ 200,000 $ 203,000 $ 251,000
Income tax effect recognized as a credit to additional paid-in capital related to share-based compensation $ 0 0 (8,000)
Number of share-based compensation plans maintained by the company | item 3    
2009 Plan      
Share-based compensation      
Share-based compensation expense $ 0 $ 0 $ 68,000
2009 Plan | Options      
Share-based compensation      
Unrecognized compensation cost, related to non-vested stock options $ 0