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Note 5. Equity Incentive Plan and Stock-Based Compensation (Detail) - Weighted Average Fair Value of Stock Options Granted (USD $)
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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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|
| Weighted average fair value of stock options granted | $ 4.99 | $ 4.04 |