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Note 4 - Short-term Investments by Security Type (Details) - USD ($)
$ in Thousands
Jun. 25, 2016
Dec. 26, 2015
Corporate Debt Securities [Member]    
Amortized Cost $ 7,647  
Gross Unrealized Gains  
Gross Unrealized Losses  
Estimated Fair Value 7,647  
Foreign Government Debt Securities [Member]    
Amortized Cost 655 $ 650
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value 655 650
Certificates of Deposit [Member]    
Amortized Cost 913 1,002
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value 913 1,002
Amortized Cost 9,215 1,652
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value $ 9,215 $ 1,652 [1]
[1] Derived from December 26, 2015 audited financial statements