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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Deferred tax assets: |  |
Pension | $ 321 | $ 373
Intangibles |  | 29
Capitalized research and development expenses | 651 |
Other reserves and accruals | 1,118 | 596
Inventory reserves and other | 278 | 244
Federal and state tax credits | 771 | 1,273
Federal and state net operating loss carryforwards |  | 151
Foreign net operating loss carryforwards | 2,945 | 2,693
Lease Liability | 239 |
Gross deferred tax assets | 6,323 | 5,359
Less: valuation allowance | (3,283) | (5,029)
Realizable deferred tax asset | 3,040 | 330
Deferred tax liabilities: |  |
Depreciation and amortization | (84) | (121)
ROU Asset | (235) |
Pension | (372) | (209)
Intangibles | (3) |
Realizable deferred tax liabilities | (694) | (330)
Net deferred tax assets | $ 2,346 | $ 0

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