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Note 3 - Stock-based Compensation (Tables) | 3 Months Ended
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Aug. 30, 2015
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended August 30, 2015 |  |  | Three Months Ended August 31, 2014 |
Options |  | $ | 330 |  |  | $ | 133 |
RSUs |  |  | 467 |  |  |  | 265 |
Total stock-based compensation expense |  | $ | 797 |  |  | $ | 398 |
|  | Three Months Ended August 30, 2015 |  |  | Three Months Ended August 31, 2014 |
Research and development |  | $ | 60 |  |  | $ | 12 |
Sales, general and administrative |  |  | 737 |  |  |  | 386 |
Total stock-based compensation expense |  | $ | 797 |  |  | $ | 398 |

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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 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 3: 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 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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