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Note 5 - Short-Term Investments (Details) (USD $) | 9 Months Ended | 12 Months Ended
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Sep. 28, 2014 | Dec. 28, 2014 | Dec. 29, 2013
Note 5 - Short-Term Investments (Details) [Line Items] |  |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | $ (22,000)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 | $ (100,000)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 | $ 0 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Short-term Investments [Member] |  |  |
Note 5 - Short-Term Investments (Details) [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments |  | $ 0 us-gaap_ImpairmentOfInvestments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | $ 0 us-gaap_ImpairmentOfInvestments / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember

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- 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 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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