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Income Taxes - Tax Effects of Temporary Differences and Carry-Forwards (Details) - USD ($) | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred Tax Assets [Abstract] |  |  |
Inventory reserve | $ 239,000 |  | $ 301,000
Other reserves and accruals | 358,000 |  | 207,000
Stock-based compensation | 6,000 |  | 23,000
Tax credit carry-forwards | 1,724,000 |  | 1,966,000
Federal tax loss carry-forwards | 1,169,000 |  | 1,980,000
State tax loss carry-forwards | 250,000 |  | 734,000
Foreign tax loss carry-forwards | 67,000 |  | 127,000
Total deferred income taxes | 3,813,000 |  | 5,338,000
Valuation allowance | (388,000) | $ (400,000) | (5,097,000)
Total deferred income tax liabilities | 118,000 |  | 114,000
Net deferred tax assets | 3,307,000 |  | 127,000
Deferred Tax Liabilities [Abstract] |  |  |
Fixed assets | 100,000 |  | 90,000
Other | 18,000 |  | 24,000
Total deferred income tax liabilities | $ 118,000 |  | $ 114,000

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