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Note 4 - Stock-Based Compensation - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2016	Mar. 01, 2015	Feb. 28, 2016	Mar. 01, 2015
Employee Stock Option [Member]
Stock-based Compensation Expense	$ 331	$ 139	$ 1,021	$ 394
Restricted Stock Units (RSUs) [Member]
Stock-based Compensation Expense	553	252	1,560	745
Research and Development Expense [Member]
Stock-based Compensation Expense	59	8	179	28
Selling, General and Administrative Expenses [Member]
Stock-based Compensation Expense	825	383	2,402	1,111
Stock-based Compensation Expense	$ 884	$ 391	$ 2,581	$ 1,139

X

- 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 S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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 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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Balance Type:	debit
Period Type:	duration

X

- Details

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- Details

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- Details

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X

- Details

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