Note 4 - Other Investments (Details) In Millions, unless otherwise specified	3 Months Ended
Mar. 28, 2015 USD ($)	Mar. 28, 2015 EUR (€)	Dec. 27, 2014 USD ($)	Dec. 27, 2014 EUR (€)
Equity Method Investments and Joint Ventures [Abstract]
Marketable Securities, Equity Securities	$ 12.9	€ 11.7	$ 12.1	€ 9.9
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ 2.0

Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration