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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Deferred tax assets:    
Pension $ 373 $ 1,006
Intangibles 29 61
Other reserves and accruals 596 628
Inventory reserves and other 244 232
Federal and state tax credits 1,273 1,141
Federal and state net operating loss carryforwards 151 123
Foreign net operating loss carryforwards 2,693 2,333
Gross deferred tax assets 5,359 5,524
Less: valuation allowance (5,029) (5,334)
Realizable deferred tax asset 330 190
Deferred tax liabilities:    
Depreciation and amortization 121 190
Pension (209)  
Realizable deferred tax liabilities (330) (190)
Net deferred tax assets $ 0 $ 0