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Note 7 - Income Taxes - Open Tax Year (Details) | 12 Months Ended
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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

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- 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 + Details
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