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Note 13 - Estimated Fair Value of Financial Instruments, Current Year (Details) - USD ($) | Sep. 30, 2015 | Dec. 28, 2014
--- | --- | ---
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value | $ 0 | $ 23,984,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Fair value |  | 23,984,000
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value | 0 | 21,693,000
Corporate Bond Securities [Member] |  |
Fair value |  | 21,693,000
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value | $ 0 | 961,000
Certificates of Deposit [Member] |  |
Fair value |  | 961,000
Fair value |  | $ 46,638,000

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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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- Details
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