2. STOCK-BASED COMPENSATION (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Aug. 31, 2017	Aug. 31, 2016
Stock-based compensation costs capitalized as part of inventory	$ 0	$ 0
Intrinsic value of options exercised	$ 476	52
Weighted average remaining contractual life of the options exercisable and expected to be exercisable	3 years 8 months 19 days
Stock Option and RSU Transactions
Stock-based compensation expense related to stock options and RSUs	$ 201	279
Restricted Stock Units granted (in thousands)	64
Market value on the date of the grant	$ 3.93
Restricted Stock Units vested (in thousands)	2
Restricted Stock Units unvested (in thousands)	93
Restricted Stock Units unvested intrinsic value	$ 314
2006 and 2016 Equity Incentive Plans
Unrecognized stock-based compensation	1,444
Estimated forfeitures of unvested stock based awards, amount	$ 4
Weighted average period for recognition of costs	2 years 7 months 6 days
Employee Stock Purchase Plan
Weighted average period for recognition of costs	6 months
Stock-based compensation related to the ESPP	$ 15	$ 40
Compensation cost related to purchase rights under the ESPP but not yet recognized	$ 18
ESPP purchase right granted (in thousands)	0	0
ESPP shares issued (in thousands)	0	0
ESPP shares available for issuance (in thousands)	381

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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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