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Note 3 - Short-term Investments (Details) - Short-term Investments - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 28, 2015	Dec. 28, 2014
Note 3 - Short-term Investments (Details) - Short-term Investments [Line Items]
Amortized Cost	$ 40,613	$ 46,660
Fair Value	40,593	46,638
Unrealized Gain (Loss)	(20)	(22)
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Note 3 - Short-term Investments (Details) - Short-term Investments [Line Items]
Amortized Cost	6,989	23,982
Fair Value	6,988	23,984
Unrealized Gain (Loss)	(1)	2
Corporate Bond Securities [Member]
Note 3 - Short-term Investments (Details) - Short-term Investments [Line Items]
Amortized Cost	33,624	21,717
Fair Value	33,605	21,693
Unrealized Gain (Loss)	$ (19)	(24)
Certificates of Deposit [Member]
Note 3 - Short-term Investments (Details) - Short-term Investments [Line Items]
Amortized Cost		961
Fair Value		961
Unrealized Gain (Loss)		$ 0

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

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