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Note 4 - Stock-based Compensation (Tables) | 9 Months Ended
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Feb. 28, 2016
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended February 28, 2016 |  |  | Three Months Ended March 1 , 201 5 |  |  | Nine Months Ended February 28 , 201 6 |  |  | Nine Months Ended March 1 , 201 5 |
Options |  | $ | 331 |  |  | $ | 139 |  |  | $ | 1,021 |  |  | $ | 394 |
RSUs |  |  | 553 |  |  |  | 252 |  |  |  | 1,560 |  |  |  | 745 |
Total stock-based compensation |  | $ | 884 |  |  | $ | 391 |  |  | $ | 2,581 |  |  | $ | 1,139 |
|  | Three Months Ended February 28 , 201 6 |  |  | Three Months Ended March 1 , 201 5 |  |  | Nine Months Ended February 28 , 201 6 |  |  | Nine Months Ended March 1 , 201 5 |
Research and development |  | $ | 59 |  |  | $ | 8 |  |  | $ | 179 |  |  | $ | 28 |
Sales, general and administrative |  |  | 825 |  |  |  | 383 |  |  |  | 2,402 |  |  |  | 1,111 |
Total stock-based compensation |  | $ | 884 |  |  | $ | 391 |  |  | $ | 2,581 |  |  | $ | 1,139 |

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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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