Components of Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Deferred income tax assets:
Allowance for doubtful accounts	$ 115	$ 84
Inventories	8,513	8,042
Loss and tax credit carry-forwards	34,643	32,523
Stock-based compensation	262	398
Accrued product warranty	107	79
Contingent earn-out consideration		917
Accrued compensated absences	347	320
Property and equipment	578	487
Prepaid income taxes	92	266
Other reserves	45	125
Subtotal deferred income tax assets	44,702	43,241
Valuation allowance	(41,376)	(37,372)
Net deferred income tax assets	3,326	5,869
Deferred income tax liabilities:
Inventories		(6)
Right-of-use assets	(109)	(131)
Intangible assets	(356)	(642)
Property, plant and equipment and other	(2,874)	(5,121)
Total deferred income tax liabilities	(3,339)	(5,900)
Net deferred income tax liabilities	(13)	(31)
U.S.
Deferred income tax assets:
Allowance for doubtful accounts	109	80
Inventories	8,295	8,042
Loss and tax credit carry-forwards	29,606	27,578
Stock-based compensation	262	398
Accrued product warranty	99	77
Contingent earn-out consideration		917
Accrued compensated absences	347	320
Other reserves	30	114
Subtotal deferred income tax assets	38,748	37,526
Valuation allowance	(35,462)	(31,668)
Net deferred income tax assets	3,286	5,858
Deferred income tax liabilities:
Right-of-use assets	(109)	(131)
Intangible assets	(356)	(642)
Property, plant and equipment and other	(2,821)	(5,085)
Total deferred income tax liabilities	(3,286)	(5,858)
Non U.S.
Deferred income tax assets:
Allowance for doubtful accounts	6	4
Inventories	218
Loss and tax credit carry-forwards	5,037	4,945
Accrued product warranty	8	2
Property and equipment	578	487
Prepaid income taxes	92	266
Other reserves	15	11
Subtotal deferred income tax assets	5,954	5,715
Valuation allowance	(5,914)	(5,704)
Net deferred income tax assets	40	11
Deferred income tax liabilities:
Inventories		(6)
Property, plant and equipment and other	(53)	(36)
Total deferred income tax liabilities	(53)	(42)
Net deferred income tax liabilities	$ (13)	$ (31)