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Note 13 - Estimated Fair Value of Financial Instruments, Current Year (Details) - USD ($)
Sep. 30, 2015
Dec. 28, 2014
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value $ 0 $ 23,984,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]    
Fair value   23,984,000
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 0 21,693,000
Corporate Bond Securities [Member]    
Fair value   21,693,000
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value $ 0 961,000
Certificates of Deposit [Member]    
Fair value   961,000
Fair value   $ 46,638,000