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Note 7 - Income Taxes - Open Tax Year (Details)	12 Months Ended
	Dec. 30, 2017
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Open tax year	2016
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Open tax year	2017
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member] | Earliest Tax Year [Member]
Open tax year	2009
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member] | Latest Tax Year [Member]
Open tax year	2017

X

- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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