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Note 3 - Stock-based Compensation (Tables)

6 Months Ended

Nov. 30, 2014

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		Three Months Ended November 30 , 2014				Three Months Ended November 24 , 2013				Six Months Ended November 30 , 2014				Six Months Ended November 24 , 2013
Options		$	122,000			$	177,000			$	255,000			$	285,000
RSUs			228,000				184,000			$	493,000			$	354,000
Total stock-based compensation		$	350,000			$	361,000			$	748,000			$	639,000

		Three Months Ended November 30 , 2014				Three Months Ended November 24 , 2013				Six Months Ended November 30 , 2014				Six Months Ended November 24 , 2013
Research and development		$	8,000			$	—			$	20,000			$	14,000
Sales, general and administrative			342,000				361,000				728,000				625,000
Total stock-based compensation		$	350,000			$	361,000			$	748,000			$	639,000

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration