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Note 6 - Milestone Revenue Recognition (Details Textual) - USD ($) | 6 Months Ended
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Jul. 05, 2015 | Jun. 29, 2014
Revenue Recognition, Milestone Method, Revenue Recognized | $ 300,000 | $ 2,300,000

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- Definition The amount of consideration recognized during the period for the milestone or milestones. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 28 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51671726&loc=SL6892177-166501 + Details
Name: | us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration