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Note 14 - Financial Instruments and Fair Value Measurements (Details) - Estimated Fair Value of Financial Instruments, Current Year - USD ($) $ in Thousands | Jun. 28, 2015 | Dec. 28, 2014
--- | --- | ---
Short-Term Investments |  |
Available for sale securities | $ 40,593 | $ 46,638
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Short-Term Investments |  |
Available for sale securities | 6,988 | 23,984
Corporate Bond Securities [Member] |  |
Short-Term Investments |  |
Available for sale securities | 33,605 | 21,693
Certificates of Deposit [Member] |  |
Short-Term Investments |  |
Available for sale securities |  | 961
Fair Value, Inputs, Level 2 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Short-Term Investments |  |
Available for sale securities | 6,988 | 23,984
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member] |  |
Short-Term Investments |  |
Available for sale securities | $ 33,605 | 21,693
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Short-Term Investments |  |
Available for sale securities |  | $ 961

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- 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) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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