14. STOCK-BASED COMPENSATION (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Aug. 31, 2020	Aug. 31, 2019
Stock-based compensation costs capitalized as part of inventory	$ 0	$ 0
Intrinsic value of options exercised	$ 92	17
Weighted average remaining contractual life of the options exercisable and expected to be exercisable	3 years 11 months 5 days
Stock Option and RSU Transactions
Stock-based compensation expense related to stock options and RSUs	$ 245	$ 150
Restricted stock units granted (in thousands)	196
Market value on the date of the grant	$ 1.86
Restricted stock units vested (in thousands)	3	3
Restricted stock units unvested (in thousands)	166	20
Restricted stock units unvested intrinsic value	$ 296	$ 26
2016 Equity Incentive Plan
Unrecognized stock-based compensation	1,434
Estimated forfeitures of unvested stock based awards, amount	$ 4
Weighted average period for recognition of costs	2 years 10 months 24 days
Employee Stock Purchase Plan
Weighted average period for recognition of costs	8 months 12 days
Stock-based compensation related to the ESPP	$ 25	$ 49
Compensation cost related to purchase rights under the ESPP but not yet recognized	$ 34
ESPP purchase right granted (in thousands)	0	0
ESPP shares issued (in thousands)	0	0
ESPP shares available for issuance (in thousands)	233

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

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