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Note 3 - Short-Term Investments (Details) - Short-Term Investments (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 29, 2015	Dec. 28, 2014
Note 3 - Short-Term Investments (Details) - Short-Term Investments [Line Items]
Amortized Cost	$ 46,168us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 46,660us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value	46,145us-gaap_AvailableForSaleSecurities	46,638us-gaap_AvailableForSaleSecurities
Unrealized Gain (Loss)	(23)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1	(22)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Note 3 - Short-Term Investments (Details) - Short-Term Investments [Line Items]
Amortized Cost	11,984us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember	23,982us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Fair Value	11,984us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember	23,984us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Unrealized Gain (Loss)	0us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember	2us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Corporate Bond Securities [Member]
Note 3 - Short-Term Investments (Details) - Short-Term Investments [Line Items]
Amortized Cost	33,704us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember	21,717us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Fair Value	33,681us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember	21,693us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Unrealized Gain (Loss)	(23)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember	(24)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Certificates of Deposit [Member]
Note 3 - Short-Term Investments (Details) - Short-Term Investments [Line Items]
Amortized Cost	480us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember	961us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember
Fair Value	480us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember	961us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember
Unrealized Gain (Loss)	$ 0us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember	$ 0us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember

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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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-Topic 320

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

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