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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Oct. 01, 2019
Lessee, Lease, Description [Line Items]          
Operating lease cost $ 92 $ 85 $ 185 $ 174  
Short-term lease cost 0 0 0 0  
Total lease cost 92 85 185 174  
Operating cash flows from operating leases $ 83 $ 78 $ 166 $ 155  
Weighted average remaining lease term-operating leases 6 years 3 months 18 days 7 years 2 months 12 days 6 years 3 months 18 days 7 years 2 months 12 days  
Weighted average discount rate-operating leases 2.34% 2.25% 2.34% 2.25%  
Minimum          
Lessee, Lease, Description [Line Items]          
Remaining lease term         2 years
Operating lease, renewal term 2 years   2 years    
Maximum          
Lessee, Lease, Description [Line Items]          
Remaining lease term         7 years
Operating lease, renewal term 5 years   5 years