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Note 16 - Employee Retirement Plan (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |
Defined Benefit Plan, Contributions by Employer | $ 0.2 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 0.1 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 0.1 us-gaap_DefinedBenefitPlanContributionsByEmployer

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration