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Note 4 - Short-term Investments by Security Type (Details) - USD ($)
Mar. 26, 2016
Dec. 26, 2015
Corporate Debt Securities [Member]    
Amortized Cost $ 8,890,000  
Gross Unrealized Gains $ 1,000  
Gross Unrealized Losses  
Short-term investments $ 8,891,000  
Foreign Government Debt Securities [Member]    
Amortized Cost $ 661,000 $ 650,000
Gross Unrealized Gains
Gross Unrealized Losses
Short-term investments $ 661,000 $ 650,000
Certificates of Deposit [Member]    
Amortized Cost $ 24,000 $ 1,002,000
Gross Unrealized Gains
Gross Unrealized Losses
Short-term investments $ 24,000 $ 1,002,000
Amortized Cost 9,575,000 $ 1,652,000
Gross Unrealized Gains $ 1,000
Gross Unrealized Losses
Short-term investments $ 9,576,000 $ 1,652,000 [1]
[1] Derived from December 26, 2015 audited financial statements