Leases (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Oct. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease, renewal term	5 years			5 years
Operating lease cost	$ 85		$ 94	$ 174	$ 188
Short-term lease cost	0		0	0	0
Total lease cost	85		94	$ 174	188
Operating cash flows from operating leases	$ 78	$ 155	$ 87		$ 174
Weighted average remaining lease term-operating leases	7 years 2 months 12 days		8 years 1 month 6 days	7 years 2 months 12 days	8 years 1 month 6 days	7 years 2 months 12 days	8 years 1 month 6 days
Weighted average discount rate-operating leases	2.25%		2.24%	2.25%	2.24%	2.25%	2.24%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term								4 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term								9 years