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Note 6 - Stock-Based Compensation (Tables) | 6 Months Ended
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Nov. 24, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended November 24, 2013 |  |  | Three Months Ended November 25, 2012 |  |  | Six Months Ended November 24, 2013 |  |  | Six Months Ended November 25, 2012 |
Research and development |  | $ | — |  |  | $ | 104,000 |  |  | $ | 14,000 |  |  | $ | 214,000 |
Sales, general and administrative |  | $ | 361,000 |  |  | $ | 219,000 |  |  | $ | 625,000 |  |  | $ | 457,000 |
Total stock-based compensation |  | $ | 361,000 |  |  | $ | 323,000 |  |  | $ | 639,000 |  |  | $ | 671,000 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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