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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Deferred tax assets - current: |  |
Capitalized inventory costs | $ 193 | $ 210
Inventory write-downs | 1,333 | 1,945
Accrued warranty | 204 | 260
Deferred profits | 1,006 | 1,190
Accruals and reserves not currently deductible | 5,017 | 1,945
Deferred tax assets (liabilities)- non-current: |  |
Stock option expense | 738 | 1,080
Book vs. tax basis of acquired assets | 0 | (1,290)
Federal net operating loss carryforwards | 2,922 | 4,820
Foreign and state net operating losses | 13,860 | 14,800
Book vs. tax depreciation and amortization | (1,667) | (2,250)
Foreign tax credits | 0 | 420
Other deferred tax assets | 163 | 0
Total deferred tax assets | 23,769 | 23,130
Valuation allowance | (23,769) | (22,930)
Deferred tax assets, net of valuation allowance | $ 0 | $ 200

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