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Note 5. Equity Incentive Plan and Stock-Based Compensation (Detail) - Valuation Assumption - Stock Options (Stock Options [Member])
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3 Months Ended | |
|---|---|---|
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Mar. 31, 2013
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Mar. 25, 2012
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Stock Options [Member]
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| Expected volatility | 54.03% | 51.36% |
| Risk-free interest rate | 0.60% | 0.92% |
| Expected term (in years) | 4 years 127 days | 4 years 127 days |
| Dividend yield | 0.00% | 0.00% |