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Note 6 - Stock-Based Compensation (Details) - Summary of Stock-Based Compensation by Income Statement Line Item (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 23, 2014 | Feb. 24, 2013 | Feb. 23, 2014 | Feb. 24, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation | $ 353,000 | $ 464,000 | $ 992,000 | $ 1,135,000
Research and Development Expense [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation | 14,000 | 251,000 | 28,000 | 465,000
Sales, General and Administrative [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation | $ 339,000 | $ 213,000 | $ 964,000 | $ 670,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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