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Share-Based Compensation - Fair Value assumptions for 2009 stock option plan (Details) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based compensation      
Share-based compensation expense $ 200,000 $ 203,000 $ 251,000
2009 Plan      
Share-based compensation      
Share-based compensation expense 0 0 68,000
2009 Plan | Non-employee director      
Share-based compensation      
Share-based compensation expense 200,000 $ 203,000 $ 178,000
2009 Plan | Options      
Share-based compensation      
Unrecognized compensation cost, related to non-vested stock options $ 0    
2009 Plan | Options | Minimum      
Share-based compensation      
Vesting period 3 years    
2009 Plan | Options | Maximum      
Share-based compensation      
Expiration term 10 years    
Vesting period 5 years