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Note 3 - Short-term Investments (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2014 USD ($)
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	$ 23,982
Fair Value	23,984
Unrealized Gain/(Loss)	2
Corporate Bond Securities [Member]
Amortized Cost	21,717
Fair Value	21,693
Unrealized Gain/(Loss)	(24)
Certificates of Deposit [Member]
Amortized Cost	961
Fair Value	$ 961
Unrealized Gain/(Loss)
Amortized Cost	$ 46,660
Fair Value	46,638
Unrealized Gain/(Loss)	$ (22)

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 25



-Paragraph 1



-Subparagraph (b)



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-Name Accounting Standards Codification



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-Section 50



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-Section 45



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X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.2)



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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 9



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X

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X

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