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2. STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Stock-based compensation in the form of employee stock options and ESPP shares, included in:
Total stock-based compensation	$ 169	$ 165
Cost of Sales
Stock-based compensation in the form of employee stock options and ESPP shares, included in:
Total stock-based compensation	13	19
Selling, General and Administrative
Stock-based compensation in the form of employee stock options and ESPP shares, included in:
Total stock-based compensation	119	93
Research and Development
Stock-based compensation in the form of employee stock options and ESPP shares, included in:
Total stock-based compensation	$ 37	$ 53

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.

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