13. STOCKHOLDERS' EQUITY, COMPREHENSIVE INCOME AND STOCK-BASED COMPENSATION (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Stock-based compensation costs capitalized as part of inventory	$ 0		$ 0
Intrinsic value of options exercised	23	$ 269	$ 162	$ 745
Weighted average remaining contractual life of the options exercisable and expected to be exercisable			3 years 8 months 1 day
Stock Option and RSU Transactions
Stock-based compensation expense related to stock options and RSUs	$ 166	$ 207	$ 339	$ 408
Restricted Stock Units granted (in thousands)	0	0	0	64
Market value on the date of the grant				$ 3.93
Restricted Stock Units vested (in thousands)	4	4	9	7
Restricted Stock Units unvested (in thousands)	38	89	38	89
Restricted Stock Units unvested intrinsic value	$ 72	$ 227	$ 72	$ 227
2016 Equity Incentive Plan
Unrecognized stock-based compensation	1,582		1,582
Estimated forfeitures of unvested stock based awards, amount	4		$ 4
Weighted average period for recognition of costs			3 years 2 months 12 days
Employee Stock Purchase Plan
Weighted average period for recognition of costs			1 year 3 months 18 days
Stock-based compensation related to the ESPP	58	$ 157	$ 141	$ 172
Compensation cost related to purchase rights under the ESPP but not yet recognized	$ 217		$ 217
ESPP purchase right granted (in thousands)	327	0	327	0
ESPP shares issued (in thousands)	64	116	64	116
ESPP shares available for issuance (in thousands)	430		430

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Unrecognized cost of unvested share-based compensation awards.

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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.

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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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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