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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) | Sep. 30, 2021 | Sep. 30, 2020
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Deferred Tax Assets: |  |
Accrued liabilities and reserves | $ 276,000 | $ 340,000
Allowance for doubtful accounts | 72,000 | 98,000
Inventory | 1,783,000 | 369,000
Stock-based compensation | 79,000 | 81,000
Net operating losses carryforwards | 20,000 | 5,000
Gross Deferred Income Tax Assets | 2,230,000 | 893,000
Deferred and Other Tax Liabilities: |  |
Domestic international sales corporation | (236,000) | (329,000)
Property and equipment | (1,943,000) | (1,158,000)
Unrealized gain on investment | (295,000) | (2,000)
Unrecognized tax benefits | (150,000) | (150,000)
Gross Deferred and Other Income Tax Liabilities | (2,624,000) | (1,639,000)
Net Deferred and Other Income Tax Assets (Liabilities) | $ (394,000) | $ (746,000)

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