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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
 [1]
Oct. 01, 2019
Leases [Abstract]            
Operating lease right-of-use ("ROU") assets $ 2,436   $ 2,436   $ 2,587 $ 2,890
Operating lease cost 92 $ 83 185 $ 166    
Short-term lease cost 0 0 0 0    
Total lease cost 92 83 185 166    
Operating cash flows from operating leases $ 80 $ 80 $ 160 $ 158    
Weighted average remaining lease term-operating leases 8 years 9 months 18 days 9 years 8 months 12 days 8 years 9 months 18 days 9 years 8 months 12 days    
Weighted average discount rate-operating leases 2.23% 2.22% 2.23% 2.22%    
[1] Derived from audited consolidated financial statements.