Note 6 - Stock Based Compensation (Details) - Summary of Unrecognized Stock-based Compensation Cost (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 27, 2014
Unrecognized stock based compensation cost
Option plans	$ 7
Restricted Stock Units (RSUs) [Member]
Unrecognized stock based compensation cost
Restricted stock units	$ 3,211
Weighted average remaining recognition period
Weighted-average remaining recognition period	1 year 109 days
Employee Stock Option [Member]
Weighted average remaining recognition period
Weighted-average remaining recognition period	1 year 292 days

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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