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Note 16 - Estimated Fair Value of Financial Instruments (Details) - USD ($)	Dec. 31, 2015	Dec. 28, 2014
Fair Value, Inputs, Level 2 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Fair Value	$ 0	$ 23,984,000
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member]
Fair Value	0	21,693,000
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Fair Value	$ 0	961,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Fair Value		23,984,000
Corporate Bond Securities [Member]
Fair Value		21,693,000
Certificates of Deposit [Member]
Fair Value		961,000
Fair Value		$ 46,638,000

X

- 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

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