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Share-Based Compensation - 1998 Stock-Based Incentive Compensation 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
Options      
Outstanding at the beginning of the period (in shares) 586,834 589,168  
Outstanding at the end of the period (in shares) 550,834 586,834 589,168
1998 Plan      
Share-based compensation      
Number of shares of common stock reserved for awards 3,389,000    
Share-based compensation expense $ 0 $ 0 $ 0
1998 Plan | Options      
Options      
Outstanding at the beginning of the period (in shares) 30,000 30,000 53,000
Granted (in shares) 0 0 0
Exercised (in shares) 0 0 0
Cancelled (in shares) (30,000)   (23,000)
Outstanding at the end of the period (in shares)   30,000 30,000
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 6.27 $ 6.27 $ 8.83
Granted (in dollars per share) 0.00 0.00 0.00
Cancelled (in dollars per share) 6.27   12.17
Outstanding at the end of the period (in dollars per share)   6.27 6.27
Aggregate Intrinsic Value      
Intrinsic value of options granted (in dollars per share) $ 0 $ 0 $ 0