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Share-Based Compensation - Summary of information about stock options 1998 plan (Details) - 1998 Plan - Options
 12 Months Ended
Sep. 30, 2017
$ / shares
shares
Information about stock options, by exercise price range  
Options outstanding at the end of the period (in shares) | shares 30,000
Options Outstanding - Weighted-Average Remaining Contractual Life 4 months 22 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 6.27
Options exercisable at the end of the period (in shares) | shares 30,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 6.27
Range of Exercise Price - $5.01 - $10.00  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) 5.01
Exercise price, high end of range (in dollars per share) $ 10.00
Options outstanding at the end of the period (in shares) | shares 30,000
Options Outstanding - Weighted-Average Remaining Contractual Life 4 months 22 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 6.27
Options exercisable at the end of the period (in shares) | shares 30,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 6.27