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Note 5 - Equity Incentive Plan and Stock-Based Compensation (Details) - Fair Value Assumptions Used to Value PSU Awards Granted (Performance Stock Units [Member], USD $)
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3 Months Ended | |
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Mar. 30, 2014
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Mar. 31, 2013
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Performance Stock Units [Member]
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| Note 5 - Equity Incentive Plan and Stock-Based Compensation (Details) - Fair Value Assumptions Used to Value PSU Awards Granted [Line Items] | ||
| Stock price on grant date (in Dollars per share) | $ 16.58 | $ 11.50 |
| Expected volatility | 42.79% | 50.90% |
| Risk-free interest rate | 0.73% | 0.21% |
| Dividend yield | 0.00% | 0.00% |