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Leases (Details) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 30, 2025 USD ($) lease	Jun. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2025 USD ($) lease	Jun. 30, 2024 USD ($)	Sep. 30, 2024
Lessee, Lease, Description [Line Items]
Number of operating leases | lease	2			2
Operating lease cost	$ 87	$ 98		$ 284	$ 283
Short-term lease cost	0	0		0	0
Total lease cost	87	98		$ 284	283
Operating cash flows from operating leases	$ 84	$ 83	$ 252		$ 249
Weighted average remaining lease term-operating leases	5 years 6 months	6 years 1 month 6 days		5 years 6 months	6 years 1 month 6 days	5 years 6 months
Weighted average discount rate-operating leases	2.35%	2.34%		2.35%	2.34%	2.35%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	2 years			2 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	7 years			7 years
Operating lease, renewal term	5 years			5 years

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