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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Deferred tax assets:
Pension	$ 1,006	$ 1,410
Intangibles	61	94
Other reserves and accruals	628	1,131
Inventory reserves and other	232	684
Federal and state tax credits	1,141	391
Federal and state net operating loss carryforwards	123	3
Foreign net operating loss carryforwards	2,333	1,766
Depreciation and amortization	(190)	(244)
Gross deferred tax assets	5,334	5,235
Less: valuation allowance	(5,334)	(4,086)
Realizable deferred tax asset	$ 0	$ 1,149

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