Note 6 - Equity Incentive Plan and Stock-Based Compensation (Details) - Key Executive RSUs and PSU Award Activities (USD $)
 9 Months Ended
Sep. 28, 2014
Dec. 28, 2013
Key Executive Rsu [Member]
    
Note 6 - Equity Incentive Plan and Stock-Based Compensation (Details) - Key Executive RSUs and PSU Award Activities [Line Items]    
Number of Shares   974,286
Weighted Average Grant-date Fair Value   $ 12.40
Cancelled/Forfeited (357,870)  
Cancelled/Forfeited $ 11.03  
Vested (318,781)  
Vested $ 11.37  
Number of Shares 297,635 974,286
Weighted Average Grant-date Fair Value $ 15.15 $ 12.40
Performance Stock Units [Member]
    
Note 6 - Equity Incentive Plan and Stock-Based Compensation (Details) - Key Executive RSUs and PSU Award Activities [Line Items]    
Number of Shares   362,000
Weighted Average Grant-date Fair Value   $ 7.38
Granted 274,000 [1]  
Granted $ 17.94  
Cancelled/Forfeited (18,000)  
Cancelled/Forfeited $ 7.40  
Vested (172,000)  
Vested $ 7.40  
Number of Shares 446,000 362,000
Weighted Average Grant-date Fair Value $ 13.86 $ 7.38
[1] Includes performance awards granted in fiscal 2014 at target. Additional awards that could be earned under the fiscal 2014 grant total 137,000.