2. STOCK-BASED COMPENSATION (Details Narrative) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Stock-based compensation costs capitalized as part of inventory	$ 60	$ 0	$ 60	$ 0
Stock-based compensation expense related to stock options	245	193	407	328
Intrinsic value of options exercised	29	110	435	153
Weighted average remaining contractual life of the options exercisable and expected to be exercisable			4 years 8 months 27 days
Employee Stock Purchase Plan
Stock-based compensation related to the ESPP	32	54	67	62
Compensation cost related to options to purchase the Company's common stock under the ESPP but not yet recognized	148		148
Weighted average period for recognition of costs for ESPP			1 year 3 months 18 days
1996 Stock Option Plan and 2006 Equity Incentive Plan
Unrecognized stock-based compensation	1,749		1,749
Estimated forfeitures of unvested stock based awards	$ 4		$ 4
Weighted average remaining period of the underlying options			2 years 9 months 18 days

No authoritative reference available.

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No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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