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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) | Sep. 30, 2020 | Sep. 30, 2019
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Deferred Tax Assets: |  |
Accrued liabilities and reserves | $ 340,000 | $ 344,000
Allowance for doubtful accounts | 98,000 | 104,000
Inventory | 369,000 | 98,000
Stock-based compensation | 81,000 | 82,000
Net operating losses carryforwards | 5,000 | 7,000
Gross Deferred Income Tax Assets | 893,000 | 635,000
Deferred and Other Tax Liabilities: |  |
Domestic international sales corporation | (329,000) | (464,000)
Percentage of completion |  | (2,048,000)
Property and equipment | (1,158,000) | (1,080,000)
Unrealized gain on investment | (2,000) | (265,000)
Unrecognized tax benefits | (150,000) | (150,000)
Gross Deferred and Other Income Tax Liabilities | (1,639,000) | (4,007,000)
Net Deferred and Other Income Tax Assets (Liabilities) | $ (746,000) | $ (3,372,000)

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