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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Deferred tax assets - current: |  |
Capitalized inventory costs | $ 210 | $ 270
Inventory write-downs | 1,945 | 2,460
Accrued warranty | 260 | 160
Deferred profits | 1,190 | 1,180
Accruals and reserves not currently deductible | 1,945 | 1,720
Deferred tax assets - current | 5,550 | 5,790
Valuation allowance | (5,550) | (5,790)
Deferred tax assets - current | 0 | 0
Deferred tax assets (liabilities)- non-current: |  |
Stock option expense | 1,080 | 890
Book vs. tax basis of acquired assets | (1,290) | (1,340)
Federal net operating loss carryforwards | 4,820 | 3,370
Foreign and state net operating losses | 14,800 | 13,200
Book vs. tax depreciation and amortization | (2,250) | (2,200)
Foreign tax credits | 420 | 4,230
Other deferred tax assets | 0 | 570
Total deferred tax assets - non-current | 17,580 | 18,720
Valuation allowance | (17,380) | (18,520)
Deferred tax assets (liabilities) - non-current, net of valuation allowance | $ 200 | $ 200

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