Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Deferred tax assets:
Net operating loss carryforward	$ 2,689	$ 2,558
Tax credits	669	829
Capitalized research and development expenses	1,681	1,155
Other reserves and accruals	881	975
Lease Liability	423	121
Accrued expenses	1,165	0
Inventory reserve	327	303
Pension	422	331
Other temporary differences	2	0
Gross deferred tax assets	8,259	6,272
Less: valuation allowance	(3,167)	(2,800)
Realizable deferred tax asset	5,092	3,472
Deferred tax liabilities:
Fixed assets	(96)	(69)
Pension	(21)	(119)
ROU Asset	(416)	(550)
Realizable deferred tax liabilities	(533)	(738)
Net deferred tax assets	$ 4,559	$ 2,734