2. STOCK-BASED COMPENSATION (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Stock-based compensation costs capitalized as part of inventory	$ 0		$ 0	$ 0	$ 0
Intrinsic value of options exercised	269		359	$ 745	411
Weighted average remaining contractual life of the options exercisable and expected to be exercisable				3 years 6 months 22 days
Stock Option and RSU Transactions
Stock-based compensation expense related to stock options and RSUs	$ 207		$ 185	$ 408	$ 464
Restricted Stock Units granted (in thousands)	0	64	0	64	138
Market value on the date of the grant				$ 3.93	$ 1.68
Restricted Stock Units vested (in thousands)	4			7
Restricted Stock Units unvested (in thousands)	89			89
Restricted Stock Units unvested intrinsic value	$ 227			$ 227
2006 and 2016 Equity Incentive Plans
Unrecognized stock-based compensation	1,316			1,316
Estimated forfeitures of unvested stock based awards, amount	3			$ 3
Weighted average period for recognition of costs				2 years 6 months
Employee Stock Purchase Plan
Weighted average period for recognition of costs				3 months 18 days
Stock-based compensation related to the ESPP	157		$ 30	$ 172	$ 70
Compensation cost related to purchase rights under the ESPP but not yet recognized	$ 49			$ 49
ESPP purchase right granted (in thousands)	0		0	0	0

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Unrecognized cost of unvested share-based compensation awards.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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.

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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 related to Restricted Stock Awards, net of any shares forfeited.

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