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Income Taxes - Additional Information (Detail) (USD $)
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3 Months Ended |
12 Months Ended |
|
Aug. 31, 2012
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Aug. 31, 2012
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Aug. 31, 2011
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Aug. 31, 2010
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| Income Taxes [Line Items] |
|
|
|
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| Loss from continuing operations before income taxes related to domestic operations |
|
$ 4,800,000 |
$ 4,800,000 |
$ 14,300,000 |
| Tax Credit Carryforward Amount |
1,800,000 |
1,800,000 |
|
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| Research and development credit carryforward expiration period |
2013 |
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|
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| Research and development credit carryforward expiration period |
2015 |
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|
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| Valuation allowance |
44,000 |
44,000 |
|
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| Tax credit carryforwards related to expiration period |
|
2014 |
|
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| Charitable contribution deduction limitation as a percentage of taxable income |
10.00% |
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|
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| Carry forward period allowed |
5 years |
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|
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| Net deferred tax assets |
13,275,000 |
13,275,000 |
13,604,000 |
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| Total amount of gross unrecognized tax benefits, if recognized that would impact effective tax rate |
1,100,000 |
1,100,000 |
|
|
| Accrued interest and penalties included in long-term tax liability |
200,000 |
200,000 |
200,000 |
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| Liability increase relating to unrecognized tax benefits, interest |
|
11,000 |
|
|
| Liability increase relating to unrecognized tax benefits, penalties |
|
6,000 |
|
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| Tax refund |
3,500,000 |
3,500,000 |
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|
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Domestic Tax Authority [Member]
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|
|
|
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| Income Taxes [Line Items] |
|
|
|
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| Operating Loss Carryforwards |
18,700,000 |
18,700,000 |
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|
| Net operating loss carryforward, expiration year |
|
2030 |
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State and Local Jurisdiction [Member]
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|
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| Income Taxes [Line Items] |
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|
|
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| Research and development credit carryforward expiration period |
|
2013 |
|
|
| Research and development credit carryforward expiration period |
|
2030 |
|
|
| Operating Loss Carryforwards |
20,800,000 |
20,800,000 |
|
|
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Federal Alternative Minimum [Member]
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|
|
|
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| Income Taxes [Line Items] |
|
|
|
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| Tax Credit Carryforward Amount |
3,400,000 |
3,400,000 |
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|
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Research and Development [Member]
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|
|
|
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| Income Taxes [Line Items] |
|
|
|
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| Tax Credit Carryforward Amount |
1,400,000 |
1,400,000 |
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| Research and development credit carryforward expiration period |
|
2025 |
|
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| Research and development credit carryforward expiration period |
|
2032 |
|
|
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Small Ethanol Producer [Member]
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|
|
|
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| Income Taxes [Line Items] |
|
|
|
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| Tax Credit Carryforward Amount |
$ 2,800,000 |
$ 2,800,000 |
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| Tax credit carryforward, expiration year |
|
2014 |
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