Note 5 - Equity Incentive Plan and Stock-Based Compensation (Details) - Total Recorded Stock-based Compensation Expense (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2014
Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation expense after income taxes(1) $ 8,481 [1] $ 8,624 [1]
Cost of Sales [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock based compensation expense 1,491 1,472
Research and Development Expense [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock based compensation expense 1,964 2,795
Selling, General and Administrative Expenses [Member]
    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock based compensation expense $ 5,026 $ 4,357
[1] There was no income tax benefit related to stock-based compensation because all of the Company's U.S. deferred tax assets, net of U.S. deferred tax liabilities, continue to be subject to a full valuation allowance.