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Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $) | Sep. 30, 2014 | Sep. 30, 2013
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Deferred Tax Assets: |  |
Accrued liabilities and reserves | $ 288,000 | $ 338,000
Allowance for doubtful accounts | 91,000 | 115,000
Inventory | 186,000 | 202,000
R&D tax credits carryforwards | 671,000 | 805,000
Non-deductible stock compensation | 194,000 | 178,000
Net operating losses carryforwards | 58,000 | 59,000
Other | 24,000 | 57,000
Gross Deferred Tax Assets | 1,512,000 | 1,754,000
Deferred and Other Tax Liabilities: |  |
Unrealized gain on investments | (798,000) | (736,000)
Percentage of completion | (104,000) |
Property, plant and equipment | (964,000) | (1,179,000)
Unrecognized tax benefits | (300,000) | (300,000)
Other | (39,000) | (23,000)
Gross Deferred and Other Tax Liabilities | (2,205,000) | (2,238,000)
Net Deferred Income and Other Tax Liabilities | $ (693,000) | $ (484,000)

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