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Share-Based Compensation - Fair Value assumptions for stock option plan (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Share-Based compensation      
Share-based compensation expense $ 177,000 $ 173,000 $ 200,000
2009 Plan | Employee      
Share-Based compensation      
Share-based compensation expense 0 0 0
2009 Plan | Non-employee director      
Share-Based compensation      
Share-based compensation expense 0 173,000 200,000
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    
2019 Plan | Non-employee director      
Share-Based compensation      
Share-based compensation expense $ 160,000 0 0
2019 Plan | Options      
Share-Based compensation      
Share-based compensation expense 17,337 $ 0 $ 0
Unrecognized compensation cost, related to non-vested stock options $ 345,363    
2019 Plan | Options | Minimum      
Share-Based compensation      
Vesting period 3 years    
2019 Plan | Options | Maximum      
Share-Based compensation      
Expiration term 10 years    
Vesting period 5 years