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Shareholders' Equity and Share-based Payments (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Share-based compensation          
Common stock, shares authorized 75,000,000   75,000,000   75,000,000
Preferred stock, shares authorized 10,000,000   10,000,000   10,000,000
Share-based compensation expense     $ 0 $ 0  
Income tax effect recognized as a credit to additional paid-in capital related to share-based compensation     $ 0 0  
RSU | Director          
Share-based compensation          
Shares settled in pro rata basis 1   1    
2009 Plan          
Share-based compensation          
Share-based compensation expense   $ 200,000 $ 203,000 200,000  
Number of shares of common stock reserved for awards 1,200,000   1,200,000    
Number of shares of common stock available for awards under the plan 139,691   139,691    
2009 Plan | Employee          
Share-based compensation          
Share-based compensation expense $ 0 0 $ 0 0  
2009 Plan | Non-employee director          
Share-based compensation          
Share-based compensation expense $ 203,000 $ 200,000 $ 203,000 $ 200,000  
2009 Plan | Performance-based Award | Employee          
Share-based compensation          
Number of shares of common stock reserved for awards 300,000   300,000    
2009 Plan | RSU | Non-employee director          
Share-based compensation          
Restricted stock units outstanding ( in shares) 0   0