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Note 4 - Short-Term Investments (Details) - Short-Term Investments (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 28, 2014
Dec. 29, 2013
Note 4 - Short-Term Investments (Details) - Short-Term Investments [Line Items]    
Amortized Cost $ 47,329 $ 49,099
Fair Value 47,327 49,099
Unrealized Gain (Loss) (2) 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
    
Note 4 - Short-Term Investments (Details) - Short-Term Investments [Line Items]    
Amortized Cost 33,962 21,986
Fair Value 33,969 21,993
Unrealized Gain (Loss) 7 7
Corporate Bond Securities [Member]
    
Note 4 - Short-Term Investments (Details) - Short-Term Investments [Line Items]    
Amortized Cost 13,127 27,113
Fair Value 13,118 27,106
Unrealized Gain (Loss) (9) (7)
Certificates of Deposit [Member]
    
Note 4 - Short-Term Investments (Details) - Short-Term Investments [Line Items]    
Amortized Cost 240  
Fair Value $ 240