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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
 [1]
Oct. 01, 2019
Leases [Abstract]            
Operating lease right-of-use ("ROU") assets $ 2,360   $ 2,360   $ 2,587 $ 2,890
Operating lease cost 92 $ 118 277 $ 284    
Short-term lease cost 0 0 0 0    
Total lease cost 92 118 277 284    
Operating cash flows from operating leases $ 80 $ 80 $ 240 $ 239    
Weighted average remaining lease term-operating leases 8 years 7 months 6 days 9 years 6 months 8 years 7 months 6 days 9 years 6 months    
Weighted average discount rate-operating leases 2.23% 2.22% 2.23% 2.22%    
[1] Derived from audited consolidated financial statements.